1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
use super::pat::Expected;
use super::ty::AllowPlus;
use super::{
    BlockMode, Parser, PathStyle, RecoverColon, RecoverComma, Restrictions, SemiColonMode, SeqSep,
    TokenExpectType, TokenType,
};

use rustc_ast as ast;
use rustc_ast::ptr::P;
use rustc_ast::token::{self, Lit, LitKind, TokenKind};
use rustc_ast::util::parser::AssocOp;
use rustc_ast::{
    AngleBracketedArg, AngleBracketedArgs, AnonConst, AttrVec, BinOpKind, BindingMode, Block,
    BlockCheckMode, Expr, ExprKind, GenericArg, Generics, Item, ItemKind, Mutability, Param, Pat,
    PatKind, Path, PathSegment, QSelf, Ty, TyKind,
};
use rustc_ast_pretty::pprust;
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{pluralize, struct_span_err};
use rustc_errors::{Applicability, DiagnosticBuilder, Handler, PResult};
use rustc_span::source_map::Spanned;
use rustc_span::symbol::{kw, Ident};
use rustc_span::{MultiSpan, Span, SpanSnippetError, DUMMY_SP};

use std::mem::take;

use tracing::{debug, trace};

const TURBOFISH_SUGGESTION_STR: &str =
    "use `::<...>` instead of `<...>` to specify type or const arguments";

/// Creates a placeholder argument.
pub(super) fn dummy_arg(ident: Ident) -> Param {
    let pat = P(Pat {
        id: ast::DUMMY_NODE_ID,
        kind: PatKind::Ident(BindingMode::ByValue(Mutability::Not), ident, None),
        span: ident.span,
        tokens: None,
    });
    let ty = Ty { kind: TyKind::Err, span: ident.span, id: ast::DUMMY_NODE_ID, tokens: None };
    Param {
        attrs: AttrVec::default(),
        id: ast::DUMMY_NODE_ID,
        pat,
        span: ident.span,
        ty: P(ty),
        is_placeholder: false,
    }
}

pub enum Error {
    UselessDocComment,
}

impl Error {
    fn span_err(self, sp: impl Into<MultiSpan>, handler: &Handler) -> DiagnosticBuilder<'_> {
        match self {
            Error::UselessDocComment => {
                let mut err = struct_span_err!(
                    handler,
                    sp,
                    E0585,
                    "found a documentation comment that doesn't document anything",
                );
                err.help(
                    "doc comments must come before what they document, maybe a comment was \
                          intended with `//`?",
                );
                err
            }
        }
    }
}

pub(super) trait RecoverQPath: Sized + 'static {
    const PATH_STYLE: PathStyle = PathStyle::Expr;
    fn to_ty(&self) -> Option<P<Ty>>;
    fn recovered(qself: Option<QSelf>, path: ast::Path) -> Self;
}

impl RecoverQPath for Ty {
    const PATH_STYLE: PathStyle = PathStyle::Type;
    fn to_ty(&self) -> Option<P<Ty>> {
        Some(P(self.clone()))
    }
    fn recovered(qself: Option<QSelf>, path: ast::Path) -> Self {
        Self {
            span: path.span,
            kind: TyKind::Path(qself, path),
            id: ast::DUMMY_NODE_ID,
            tokens: None,
        }
    }
}

impl RecoverQPath for Pat {
    fn to_ty(&self) -> Option<P<Ty>> {
        self.to_ty()
    }
    fn recovered(qself: Option<QSelf>, path: ast::Path) -> Self {
        Self {
            span: path.span,
            kind: PatKind::Path(qself, path),
            id: ast::DUMMY_NODE_ID,
            tokens: None,
        }
    }
}

impl RecoverQPath for Expr {
    fn to_ty(&self) -> Option<P<Ty>> {
        self.to_ty()
    }
    fn recovered(qself: Option<QSelf>, path: ast::Path) -> Self {
        Self {
            span: path.span,
            kind: ExprKind::Path(qself, path),
            attrs: AttrVec::new(),
            id: ast::DUMMY_NODE_ID,
            tokens: None,
        }
    }
}

/// Control whether the closing delimiter should be consumed when calling `Parser::consume_block`.
crate enum ConsumeClosingDelim {
    Yes,
    No,
}

#[derive(Clone, Copy)]
pub enum AttemptLocalParseRecovery {
    Yes,
    No,
}

impl AttemptLocalParseRecovery {
    pub fn yes(&self) -> bool {
        match self {
            AttemptLocalParseRecovery::Yes => true,
            AttemptLocalParseRecovery::No => false,
        }
    }

    pub fn no(&self) -> bool {
        match self {
            AttemptLocalParseRecovery::Yes => false,
            AttemptLocalParseRecovery::No => true,
        }
    }
}

impl<'a> Parser<'a> {
    pub(super) fn span_err<S: Into<MultiSpan>>(&self, sp: S, err: Error) -> DiagnosticBuilder<'a> {
        err.span_err(sp, self.diagnostic())
    }

    pub fn struct_span_err<S: Into<MultiSpan>>(&self, sp: S, m: &str) -> DiagnosticBuilder<'a> {
        self.sess.span_diagnostic.struct_span_err(sp, m)
    }

    pub fn span_bug<S: Into<MultiSpan>>(&self, sp: S, m: &str) -> ! {
        self.sess.span_diagnostic.span_bug(sp, m)
    }

    pub(super) fn diagnostic(&self) -> &'a Handler {
        &self.sess.span_diagnostic
    }

    pub(super) fn span_to_snippet(&self, span: Span) -> Result<String, SpanSnippetError> {
        self.sess.source_map().span_to_snippet(span)
    }

    pub(super) fn expected_ident_found(&self) -> DiagnosticBuilder<'a> {
        let mut err = self.struct_span_err(
            self.token.span,
            &format!("expected identifier, found {}", super::token_descr(&self.token)),
        );
        let valid_follow = &[
            TokenKind::Eq,
            TokenKind::Colon,
            TokenKind::Comma,
            TokenKind::Semi,
            TokenKind::ModSep,
            TokenKind::OpenDelim(token::DelimToken::Brace),
            TokenKind::OpenDelim(token::DelimToken::Paren),
            TokenKind::CloseDelim(token::DelimToken::Brace),
            TokenKind::CloseDelim(token::DelimToken::Paren),
        ];
        match self.token.ident() {
            Some((ident, false))
                if ident.is_raw_guess()
                    && self.look_ahead(1, |t| valid_follow.contains(&t.kind)) =>
            {
                err.span_suggestion(
                    ident.span,
                    "you can escape reserved keywords to use them as identifiers",
                    format!("r#{}", ident.name),
                    Applicability::MaybeIncorrect,
                );
            }
            _ => {}
        }
        if let Some(token_descr) = super::token_descr_opt(&self.token) {
            err.span_label(self.token.span, format!("expected identifier, found {}", token_descr));
        } else {
            err.span_label(self.token.span, "expected identifier");
            if self.token == token::Comma && self.look_ahead(1, |t| t.is_ident()) {
                err.span_suggestion(
                    self.token.span,
                    "remove this comma",
                    String::new(),
                    Applicability::MachineApplicable,
                );
            }
        }
        err
    }

    pub(super) fn expected_one_of_not_found(
        &mut self,
        edible: &[TokenKind],
        inedible: &[TokenKind],
    ) -> PResult<'a, bool /* recovered */> {
        debug!("expected_one_of_not_found(edible: {:?}, inedible: {:?})", edible, inedible);
        fn tokens_to_string(tokens: &[TokenType]) -> String {
            let mut i = tokens.iter();
            // This might be a sign we need a connect method on `Iterator`.
            let b = i.next().map_or_else(String::new, |t| t.to_string());
            i.enumerate().fold(b, |mut b, (i, a)| {
                if tokens.len() > 2 && i == tokens.len() - 2 {
                    b.push_str(", or ");
                } else if tokens.len() == 2 && i == tokens.len() - 2 {
                    b.push_str(" or ");
                } else {
                    b.push_str(", ");
                }
                b.push_str(&a.to_string());
                b
            })
        }

        let mut expected = edible
            .iter()
            .map(|x| TokenType::Token(x.clone()))
            .chain(inedible.iter().map(|x| TokenType::Token(x.clone())))
            .chain(self.expected_tokens.iter().cloned())
            .collect::<Vec<_>>();
        expected.sort_by_cached_key(|x| x.to_string());
        expected.dedup();

        let sm = self.sess.source_map();
        let msg = format!("expected `;`, found {}", super::token_descr(&self.token));
        let appl = Applicability::MachineApplicable;
        if expected.contains(&TokenType::Token(token::Semi)) {
            if self.token.span == DUMMY_SP || self.prev_token.span == DUMMY_SP {
                // Likely inside a macro, can't provide meaningful suggestions.
            } else if !sm.is_multiline(self.prev_token.span.until(self.token.span)) {
                // The current token is in the same line as the prior token, not recoverable.
            } else if [token::Comma, token::Colon].contains(&self.token.kind)
                && self.prev_token.kind == token::CloseDelim(token::Paren)
            {
                // Likely typo: The current token is on a new line and is expected to be
                // `.`, `;`, `?`, or an operator after a close delimiter token.
                //
                // let a = std::process::Command::new("echo")
                //         .arg("1")
                //         ,arg("2")
                //         ^
                // https://github.com/rust-lang/rust/issues/72253
            } else if self.look_ahead(1, |t| {
                t == &token::CloseDelim(token::Brace)
                    || t.can_begin_expr() && t.kind != token::Colon
            }) && [token::Comma, token::Colon].contains(&self.token.kind)
            {
                // Likely typo: `,` → `;` or `:` → `;`. This is triggered if the current token is
                // either `,` or `:`, and the next token could either start a new statement or is a
                // block close. For example:
                //
                //   let x = 32:
                //   let y = 42;
                self.bump();
                let sp = self.prev_token.span;
                self.struct_span_err(sp, &msg)
                    .span_suggestion_short(sp, "change this to `;`", ";".to_string(), appl)
                    .emit();
                return Ok(true);
            } else if self.look_ahead(0, |t| {
                t == &token::CloseDelim(token::Brace)
                    || (
                        t.can_begin_expr() && t != &token::Semi && t != &token::Pound
                        // Avoid triggering with too many trailing `#` in raw string.
                    )
            }) {
                // Missing semicolon typo. This is triggered if the next token could either start a
                // new statement or is a block close. For example:
                //
                //   let x = 32
                //   let y = 42;
                let sp = self.prev_token.span.shrink_to_hi();
                self.struct_span_err(sp, &msg)
                    .span_label(self.token.span, "unexpected token")
                    .span_suggestion_short(sp, "add `;` here", ";".to_string(), appl)
                    .emit();
                return Ok(true);
            }
        }

        let expect = tokens_to_string(&expected[..]);
        let actual = super::token_descr(&self.token);
        let (msg_exp, (label_sp, label_exp)) = if expected.len() > 1 {
            let short_expect = if expected.len() > 6 {
                format!("{} possible tokens", expected.len())
            } else {
                expect.clone()
            };
            (
                format!("expected one of {}, found {}", expect, actual),
                (self.prev_token.span.shrink_to_hi(), format!("expected one of {}", short_expect)),
            )
        } else if expected.is_empty() {
            (
                format!("unexpected token: {}", actual),
                (self.prev_token.span, "unexpected token after this".to_string()),
            )
        } else {
            (
                format!("expected {}, found {}", expect, actual),
                (self.prev_token.span.shrink_to_hi(), format!("expected {}", expect)),
            )
        };
        self.last_unexpected_token_span = Some(self.token.span);
        let mut err = self.struct_span_err(self.token.span, &msg_exp);

        // Add suggestion for a missing closing angle bracket if '>' is included in expected_tokens
        // there are unclosed angle brackets
        if self.unmatched_angle_bracket_count > 0
            && self.token.kind == TokenKind::Eq
            && expected.iter().any(|tok| matches!(tok, TokenType::Token(TokenKind::Gt)))
        {
            err.span_label(self.prev_token.span, "maybe try to close unmatched angle bracket");
        }

        let sp = if self.token == token::Eof {
            // This is EOF; don't want to point at the following char, but rather the last token.
            self.prev_token.span
        } else {
            label_sp
        };
        match self.recover_closing_delimiter(
            &expected
                .iter()
                .filter_map(|tt| match tt {
                    TokenType::Token(t) => Some(t.clone()),
                    _ => None,
                })
                .collect::<Vec<_>>(),
            err,
        ) {
            Err(e) => err = e,
            Ok(recovered) => {
                return Ok(recovered);
            }
        }

        if self.check_too_many_raw_str_terminators(&mut err) {
            return Err(err);
        }

        if self.prev_token.span == DUMMY_SP {
            // Account for macro context where the previous span might not be
            // available to avoid incorrect output (#54841).
            err.span_label(self.token.span, label_exp);
        } else if !sm.is_multiline(self.token.span.shrink_to_hi().until(sp.shrink_to_lo())) {
            // When the spans are in the same line, it means that the only content between
            // them is whitespace, point at the found token in that case:
            //
            // X |     () => { syntax error };
            //   |                    ^^^^^ expected one of 8 possible tokens here
            //
            // instead of having:
            //
            // X |     () => { syntax error };
            //   |                   -^^^^^ unexpected token
            //   |                   |
            //   |                   expected one of 8 possible tokens here
            err.span_label(self.token.span, label_exp);
        } else {
            err.span_label(sp, label_exp);
            err.span_label(self.token.span, "unexpected token");
        }
        self.maybe_annotate_with_ascription(&mut err, false);
        Err(err)
    }

    fn check_too_many_raw_str_terminators(&mut self, err: &mut DiagnosticBuilder<'_>) -> bool {
        match (&self.prev_token.kind, &self.token.kind) {
            (
                TokenKind::Literal(Lit {
                    kind: LitKind::StrRaw(n_hashes) | LitKind::ByteStrRaw(n_hashes),
                    ..
                }),
                TokenKind::Pound,
            ) => {
                err.set_primary_message("too many `#` when terminating raw string");
                err.span_suggestion(
                    self.token.span,
                    "remove the extra `#`",
                    String::new(),
                    Applicability::MachineApplicable,
                );
                err.note(&format!("the raw string started with {} `#`s", n_hashes));
                true
            }
            _ => false,
        }
    }

    pub fn maybe_suggest_struct_literal(
        &mut self,
        lo: Span,
        s: BlockCheckMode,
    ) -> Option<PResult<'a, P<Block>>> {
        if self.token.is_ident() && self.look_ahead(1, |t| t == &token::Colon) {
            // We might be having a struct literal where people forgot to include the path:
            // fn foo() -> Foo {
            //     field: value,
            // }
            let mut snapshot = self.clone();
            let path =
                Path { segments: vec![], span: self.prev_token.span.shrink_to_lo(), tokens: None };
            let struct_expr = snapshot.parse_struct_expr(None, path, AttrVec::new(), false);
            let block_tail = self.parse_block_tail(lo, s, AttemptLocalParseRecovery::No);
            return Some(match (struct_expr, block_tail) {
                (Ok(expr), Err(mut err)) => {
                    // We have encountered the following:
                    // fn foo() -> Foo {
                    //     field: value,
                    // }
                    // Suggest:
                    // fn foo() -> Foo { Path {
                    //     field: value,
                    // } }
                    err.delay_as_bug();
                    self.struct_span_err(expr.span, "struct literal body without path")
                        .multipart_suggestion(
                            "you might have forgotten to add the struct literal inside the block",
                            vec![
                                (expr.span.shrink_to_lo(), "{ SomeStruct ".to_string()),
                                (expr.span.shrink_to_hi(), " }".to_string()),
                            ],
                            Applicability::MaybeIncorrect,
                        )
                        .emit();
                    *self = snapshot;
                    let mut tail = self.mk_block(
                        vec![self.mk_stmt_err(expr.span)],
                        s,
                        lo.to(self.prev_token.span),
                    );
                    tail.could_be_bare_literal = true;
                    Ok(tail)
                }
                (Err(mut err), Ok(tail)) => {
                    // We have a block tail that contains a somehow valid type ascription expr.
                    err.cancel();
                    Ok(tail)
                }
                (Err(mut snapshot_err), Err(err)) => {
                    // We don't know what went wrong, emit the normal error.
                    snapshot_err.cancel();
                    self.consume_block(token::Brace, ConsumeClosingDelim::Yes);
                    Err(err)
                }
                (Ok(_), Ok(mut tail)) => {
                    tail.could_be_bare_literal = true;
                    Ok(tail)
                }
            });
        }
        None
    }

    pub fn maybe_annotate_with_ascription(
        &mut self,
        err: &mut DiagnosticBuilder<'_>,
        maybe_expected_semicolon: bool,
    ) {
        if let Some((sp, likely_path)) = self.last_type_ascription.take() {
            let sm = self.sess.source_map();
            let next_pos = sm.lookup_char_pos(self.token.span.lo());
            let op_pos = sm.lookup_char_pos(sp.hi());

            let allow_unstable = self.sess.unstable_features.is_nightly_build();

            if likely_path {
                err.span_suggestion(
                    sp,
                    "maybe write a path separator here",
                    "::".to_string(),
                    if allow_unstable {
                        Applicability::MaybeIncorrect
                    } else {
                        Applicability::MachineApplicable
                    },
                );
                self.sess.type_ascription_path_suggestions.borrow_mut().insert(sp);
            } else if op_pos.line != next_pos.line && maybe_expected_semicolon {
                err.span_suggestion(
                    sp,
                    "try using a semicolon",
                    ";".to_string(),
                    Applicability::MaybeIncorrect,
                );
            } else if allow_unstable {
                err.span_label(sp, "tried to parse a type due to this type ascription");
            } else {
                err.span_label(sp, "tried to parse a type due to this");
            }
            if allow_unstable {
                // Give extra information about type ascription only if it's a nightly compiler.
                err.note(
                    "`#![feature(type_ascription)]` lets you annotate an expression with a type: \
                     `<expr>: <type>`",
                );
                if !likely_path {
                    // Avoid giving too much info when it was likely an unrelated typo.
                    err.note(
                        "see issue #23416 <https://github.com/rust-lang/rust/issues/23416> \
                        for more information",
                    );
                }
            }
        }
    }

    /// Eats and discards tokens until one of `kets` is encountered. Respects token trees,
    /// passes through any errors encountered. Used for error recovery.
    pub(super) fn eat_to_tokens(&mut self, kets: &[&TokenKind]) {
        if let Err(ref mut err) =
            self.parse_seq_to_before_tokens(kets, SeqSep::none(), TokenExpectType::Expect, |p| {
                Ok(p.parse_token_tree())
            })
        {
            err.cancel();
        }
    }

    /// This function checks if there are trailing angle brackets and produces
    /// a diagnostic to suggest removing them.
    ///
    /// ```ignore (diagnostic)
    /// let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>();
    ///                                                        ^^ help: remove extra angle brackets
    /// ```
    ///
    /// If `true` is returned, then trailing brackets were recovered, tokens were consumed
    /// up until one of the tokens in 'end' was encountered, and an error was emitted.
    pub(super) fn check_trailing_angle_brackets(
        &mut self,
        segment: &PathSegment,
        end: &[&TokenKind],
    ) -> bool {
        // This function is intended to be invoked after parsing a path segment where there are two
        // cases:
        //
        // 1. A specific token is expected after the path segment.
        //    eg. `x.foo(`, `x.foo::<u32>(` (parenthesis - method call),
        //        `Foo::`, or `Foo::<Bar>::` (mod sep - continued path).
        // 2. No specific token is expected after the path segment.
        //    eg. `x.foo` (field access)
        //
        // This function is called after parsing `.foo` and before parsing the token `end` (if
        // present). This includes any angle bracket arguments, such as `.foo::<u32>` or
        // `Foo::<Bar>`.

        // We only care about trailing angle brackets if we previously parsed angle bracket
        // arguments. This helps stop us incorrectly suggesting that extra angle brackets be
        // removed in this case:
        //
        // `x.foo >> (3)` (where `x.foo` is a `u32` for example)
        //
        // This case is particularly tricky as we won't notice it just looking at the tokens -
        // it will appear the same (in terms of upcoming tokens) as below (since the `::<u32>` will
        // have already been parsed):
        //
        // `x.foo::<u32>>>(3)`
        let parsed_angle_bracket_args =
            segment.args.as_ref().map_or(false, |args| args.is_angle_bracketed());

        debug!(
            "check_trailing_angle_brackets: parsed_angle_bracket_args={:?}",
            parsed_angle_bracket_args,
        );
        if !parsed_angle_bracket_args {
            return false;
        }

        // Keep the span at the start so we can highlight the sequence of `>` characters to be
        // removed.
        let lo = self.token.span;

        // We need to look-ahead to see if we have `>` characters without moving the cursor forward
        // (since we might have the field access case and the characters we're eating are
        // actual operators and not trailing characters - ie `x.foo >> 3`).
        let mut position = 0;

        // We can encounter `>` or `>>` tokens in any order, so we need to keep track of how
        // many of each (so we can correctly pluralize our error messages) and continue to
        // advance.
        let mut number_of_shr = 0;
        let mut number_of_gt = 0;
        while self.look_ahead(position, |t| {
            trace!("check_trailing_angle_brackets: t={:?}", t);
            if *t == token::BinOp(token::BinOpToken::Shr) {
                number_of_shr += 1;
                true
            } else if *t == token::Gt {
                number_of_gt += 1;
                true
            } else {
                false
            }
        }) {
            position += 1;
        }

        // If we didn't find any trailing `>` characters, then we have nothing to error about.
        debug!(
            "check_trailing_angle_brackets: number_of_gt={:?} number_of_shr={:?}",
            number_of_gt, number_of_shr,
        );
        if number_of_gt < 1 && number_of_shr < 1 {
            return false;
        }

        // Finally, double check that we have our end token as otherwise this is the
        // second case.
        if self.look_ahead(position, |t| {
            trace!("check_trailing_angle_brackets: t={:?}", t);
            end.contains(&&t.kind)
        }) {
            // Eat from where we started until the end token so that parsing can continue
            // as if we didn't have those extra angle brackets.
            self.eat_to_tokens(end);
            let span = lo.until(self.token.span);

            let total_num_of_gt = number_of_gt + number_of_shr * 2;
            self.struct_span_err(
                span,
                &format!("unmatched angle bracket{}", pluralize!(total_num_of_gt)),
            )
            .span_suggestion(
                span,
                &format!("remove extra angle bracket{}", pluralize!(total_num_of_gt)),
                String::new(),
                Applicability::MachineApplicable,
            )
            .emit();
            return true;
        }
        false
    }

    /// Check if a method call with an intended turbofish has been written without surrounding
    /// angle brackets.
    pub(super) fn check_turbofish_missing_angle_brackets(&mut self, segment: &mut PathSegment) {
        if token::ModSep == self.token.kind && segment.args.is_none() {
            let snapshot = self.clone();
            self.bump();
            let lo = self.token.span;
            match self.parse_angle_args(None) {
                Ok(args) => {
                    let span = lo.to(self.prev_token.span);
                    // Detect trailing `>` like in `x.collect::Vec<_>>()`.
                    let mut trailing_span = self.prev_token.span.shrink_to_hi();
                    while self.token.kind == token::BinOp(token::Shr)
                        || self.token.kind == token::Gt
                    {
                        trailing_span = trailing_span.to(self.token.span);
                        self.bump();
                    }
                    if self.token.kind == token::OpenDelim(token::Paren) {
                        // Recover from bad turbofish: `foo.collect::Vec<_>()`.
                        let args = AngleBracketedArgs { args, span }.into();
                        segment.args = args;

                        self.struct_span_err(
                            span,
                            "generic parameters without surrounding angle brackets",
                        )
                        .multipart_suggestion(
                            "surround the type parameters with angle brackets",
                            vec![
                                (span.shrink_to_lo(), "<".to_string()),
                                (trailing_span, ">".to_string()),
                            ],
                            Applicability::MachineApplicable,
                        )
                        .emit();
                    } else {
                        // This doesn't look like an invalid turbofish, can't recover parse state.
                        *self = snapshot;
                    }
                }
                Err(mut err) => {
                    // We couldn't parse generic parameters, unlikely to be a turbofish. Rely on
                    // generic parse error instead.
                    err.cancel();
                    *self = snapshot;
                }
            }
        }
    }

    /// When writing a turbofish with multiple type parameters missing the leading `::`, we will
    /// encounter a parse error when encountering the first `,`.
    pub(super) fn check_mistyped_turbofish_with_multiple_type_params(
        &mut self,
        mut e: DiagnosticBuilder<'a>,
        expr: &mut P<Expr>,
    ) -> PResult<'a, ()> {
        if let ExprKind::Binary(binop, _, _) = &expr.kind {
            if let ast::BinOpKind::Lt = binop.node {
                if self.eat(&token::Comma) {
                    let x = self.parse_seq_to_before_end(
                        &token::Gt,
                        SeqSep::trailing_allowed(token::Comma),
                        |p| p.parse_generic_arg(None),
                    );
                    match x {
                        Ok((_, _, false)) => {
                            if self.eat(&token::Gt) {
                                match self.parse_expr() {
                                    Ok(_) => {
                                        e.span_suggestion_verbose(
                                            binop.span.shrink_to_lo(),
                                            TURBOFISH_SUGGESTION_STR,
                                            "::".to_string(),
                                            Applicability::MaybeIncorrect,
                                        );
                                        e.emit();
                                        *expr =
                                            self.mk_expr_err(expr.span.to(self.prev_token.span));
                                        return Ok(());
                                    }
                                    Err(mut err) => {
                                        err.cancel();
                                    }
                                }
                            }
                        }
                        Err(mut err) => {
                            err.cancel();
                        }
                        _ => {}
                    }
                }
            }
        }
        Err(e)
    }

    /// Check to see if a pair of chained operators looks like an attempt at chained comparison,
    /// e.g. `1 < x <= 3`. If so, suggest either splitting the comparison into two, or
    /// parenthesising the leftmost comparison.
    fn attempt_chained_comparison_suggestion(
        &mut self,
        err: &mut DiagnosticBuilder<'_>,
        inner_op: &Expr,
        outer_op: &Spanned<AssocOp>,
    ) -> bool /* advanced the cursor */ {
        if let ExprKind::Binary(op, ref l1, ref r1) = inner_op.kind {
            if let ExprKind::Field(_, ident) = l1.kind {
                if ident.as_str().parse::<i32>().is_err() && !matches!(r1.kind, ExprKind::Lit(_)) {
                    // The parser has encountered `foo.bar<baz`, the likelihood of the turbofish
                    // suggestion being the only one to apply is high.
                    return false;
                }
            }
            let mut enclose = |left: Span, right: Span| {
                err.multipart_suggestion(
                    "parenthesize the comparison",
                    vec![
                        (left.shrink_to_lo(), "(".to_string()),
                        (right.shrink_to_hi(), ")".to_string()),
                    ],
                    Applicability::MaybeIncorrect,
                );
            };
            return match (op.node, &outer_op.node) {
                // `x == y == z`
                (BinOpKind::Eq, AssocOp::Equal) |
                // `x < y < z` and friends.
                (BinOpKind::Lt, AssocOp::Less | AssocOp::LessEqual) |
                (BinOpKind::Le, AssocOp::LessEqual | AssocOp::Less) |
                // `x > y > z` and friends.
                (BinOpKind::Gt, AssocOp::Greater | AssocOp::GreaterEqual) |
                (BinOpKind::Ge, AssocOp::GreaterEqual | AssocOp::Greater) => {
                    let expr_to_str = |e: &Expr| {
                        self.span_to_snippet(e.span)
                            .unwrap_or_else(|_| pprust::expr_to_string(&e))
                    };
                    err.span_suggestion_verbose(
                        inner_op.span.shrink_to_hi(),
                        "split the comparison into two",
                        format!(" && {}", expr_to_str(&r1)),
                        Applicability::MaybeIncorrect,
                    );
                    false // Keep the current parse behavior, where the AST is `(x < y) < z`.
                }
                // `x == y < z`
                (BinOpKind::Eq, AssocOp::Less | AssocOp::LessEqual | AssocOp::Greater | AssocOp::GreaterEqual) => {
                    // Consume `z`/outer-op-rhs.
                    let snapshot = self.clone();
                    match self.parse_expr() {
                        Ok(r2) => {
                            // We are sure that outer-op-rhs could be consumed, the suggestion is
                            // likely correct.
                            enclose(r1.span, r2.span);
                            true
                        }
                        Err(mut expr_err) => {
                            expr_err.cancel();
                            *self = snapshot;
                            false
                        }
                    }
                }
                // `x > y == z`
                (BinOpKind::Lt | BinOpKind::Le | BinOpKind::Gt | BinOpKind::Ge, AssocOp::Equal) => {
                    let snapshot = self.clone();
                    // At this point it is always valid to enclose the lhs in parentheses, no
                    // further checks are necessary.
                    match self.parse_expr() {
                        Ok(_) => {
                            enclose(l1.span, r1.span);
                            true
                        }
                        Err(mut expr_err) => {
                            expr_err.cancel();
                            *self = snapshot;
                            false
                        }
                    }
                }
                _ => false,
            };
        }
        false
    }

    /// Produces an error if comparison operators are chained (RFC #558).
    /// We only need to check the LHS, not the RHS, because all comparison ops have same
    /// precedence (see `fn precedence`) and are left-associative (see `fn fixity`).
    ///
    /// This can also be hit if someone incorrectly writes `foo<bar>()` when they should have used
    /// the turbofish (`foo::<bar>()`) syntax. We attempt some heuristic recovery if that is the
    /// case.
    ///
    /// Keep in mind that given that `outer_op.is_comparison()` holds and comparison ops are left
    /// associative we can infer that we have:
    ///
    /// ```text
    ///           outer_op
    ///           /   \
    ///     inner_op   r2
    ///        /  \
    ///      l1    r1
    /// ```
    pub(super) fn check_no_chained_comparison(
        &mut self,
        inner_op: &Expr,
        outer_op: &Spanned<AssocOp>,
    ) -> PResult<'a, Option<P<Expr>>> {
        debug_assert!(
            outer_op.node.is_comparison(),
            "check_no_chained_comparison: {:?} is not comparison",
            outer_op.node,
        );

        let mk_err_expr =
            |this: &Self, span| Ok(Some(this.mk_expr(span, ExprKind::Err, AttrVec::new())));

        match inner_op.kind {
            ExprKind::Binary(op, ref l1, ref r1) if op.node.is_comparison() => {
                let mut err = self.struct_span_err(
                    vec![op.span, self.prev_token.span],
                    "comparison operators cannot be chained",
                );

                let suggest = |err: &mut DiagnosticBuilder<'_>| {
                    err.span_suggestion_verbose(
                        op.span.shrink_to_lo(),
                        TURBOFISH_SUGGESTION_STR,
                        "::".to_string(),
                        Applicability::MaybeIncorrect,
                    );
                };

                // Include `<` to provide this recommendation even in a case like
                // `Foo<Bar<Baz<Qux, ()>>>`
                if op.node == BinOpKind::Lt && outer_op.node == AssocOp::Less
                    || outer_op.node == AssocOp::Greater
                {
                    if outer_op.node == AssocOp::Less {
                        let snapshot = self.clone();
                        self.bump();
                        // So far we have parsed `foo<bar<`, consume the rest of the type args.
                        let modifiers =
                            [(token::Lt, 1), (token::Gt, -1), (token::BinOp(token::Shr), -2)];
                        self.consume_tts(1, &modifiers[..]);

                        if !&[token::OpenDelim(token::Paren), token::ModSep]
                            .contains(&self.token.kind)
                        {
                            // We don't have `foo< bar >(` or `foo< bar >::`, so we rewind the
                            // parser and bail out.
                            *self = snapshot.clone();
                        }
                    }
                    return if token::ModSep == self.token.kind {
                        // We have some certainty that this was a bad turbofish at this point.
                        // `foo< bar >::`
                        suggest(&mut err);

                        let snapshot = self.clone();
                        self.bump(); // `::`

                        // Consume the rest of the likely `foo<bar>::new()` or return at `foo<bar>`.
                        match self.parse_expr() {
                            Ok(_) => {
                                // 99% certain that the suggestion is correct, continue parsing.
                                err.emit();
                                // FIXME: actually check that the two expressions in the binop are
                                // paths and resynthesize new fn call expression instead of using
                                // `ExprKind::Err` placeholder.
                                mk_err_expr(self, inner_op.span.to(self.prev_token.span))
                            }
                            Err(mut expr_err) => {
                                expr_err.cancel();
                                // Not entirely sure now, but we bubble the error up with the
                                // suggestion.
                                *self = snapshot;
                                Err(err)
                            }
                        }
                    } else if token::OpenDelim(token::Paren) == self.token.kind {
                        // We have high certainty that this was a bad turbofish at this point.
                        // `foo< bar >(`
                        suggest(&mut err);
                        // Consume the fn call arguments.
                        match self.consume_fn_args() {
                            Err(()) => Err(err),
                            Ok(()) => {
                                err.emit();
                                // FIXME: actually check that the two expressions in the binop are
                                // paths and resynthesize new fn call expression instead of using
                                // `ExprKind::Err` placeholder.
                                mk_err_expr(self, inner_op.span.to(self.prev_token.span))
                            }
                        }
                    } else {
                        if !matches!(l1.kind, ExprKind::Lit(_))
                            && !matches!(r1.kind, ExprKind::Lit(_))
                        {
                            // All we know is that this is `foo < bar >` and *nothing* else. Try to
                            // be helpful, but don't attempt to recover.
                            err.help(TURBOFISH_SUGGESTION_STR);
                            err.help("or use `(...)` if you meant to specify fn arguments");
                        }

                        // If it looks like a genuine attempt to chain operators (as opposed to a
                        // misformatted turbofish, for instance), suggest a correct form.
                        if self.attempt_chained_comparison_suggestion(&mut err, inner_op, outer_op)
                        {
                            err.emit();
                            mk_err_expr(self, inner_op.span.to(self.prev_token.span))
                        } else {
                            // These cases cause too many knock-down errors, bail out (#61329).
                            Err(err)
                        }
                    };
                }
                let recover =
                    self.attempt_chained_comparison_suggestion(&mut err, inner_op, outer_op);
                err.emit();
                if recover {
                    return mk_err_expr(self, inner_op.span.to(self.prev_token.span));
                }
            }
            _ => {}
        }
        Ok(None)
    }

    fn consume_fn_args(&mut self) -> Result<(), ()> {
        let snapshot = self.clone();
        self.bump(); // `(`

        // Consume the fn call arguments.
        let modifiers =
            [(token::OpenDelim(token::Paren), 1), (token::CloseDelim(token::Paren), -1)];
        self.consume_tts(1, &modifiers[..]);

        if self.token.kind == token::Eof {
            // Not entirely sure that what we consumed were fn arguments, rollback.
            *self = snapshot;
            Err(())
        } else {
            // 99% certain that the suggestion is correct, continue parsing.
            Ok(())
        }
    }

    pub(super) fn maybe_report_ambiguous_plus(
        &mut self,
        allow_plus: AllowPlus,
        impl_dyn_multi: bool,
        ty: &Ty,
    ) {
        if matches!(allow_plus, AllowPlus::No) && impl_dyn_multi {
            let sum_with_parens = format!("({})", pprust::ty_to_string(&ty));
            self.struct_span_err(ty.span, "ambiguous `+` in a type")
                .span_suggestion(
                    ty.span,
                    "use parentheses to disambiguate",
                    sum_with_parens,
                    Applicability::MachineApplicable,
                )
                .emit();
        }
    }

    pub(super) fn maybe_recover_from_bad_type_plus(
        &mut self,
        allow_plus: AllowPlus,
        ty: &Ty,
    ) -> PResult<'a, ()> {
        // Do not add `+` to expected tokens.
        if matches!(allow_plus, AllowPlus::No) || !self.token.is_like_plus() {
            return Ok(());
        }

        self.bump(); // `+`
        let bounds = self.parse_generic_bounds(None)?;
        let sum_span = ty.span.to(self.prev_token.span);

        let mut err = struct_span_err!(
            self.sess.span_diagnostic,
            sum_span,
            E0178,
            "expected a path on the left-hand side of `+`, not `{}`",
            pprust::ty_to_string(ty)
        );

        match ty.kind {
            TyKind::Rptr(ref lifetime, ref mut_ty) => {
                let sum_with_parens = pprust::to_string(|s| {
                    s.s.word("&");
                    s.print_opt_lifetime(lifetime);
                    s.print_mutability(mut_ty.mutbl, false);
                    s.popen();
                    s.print_type(&mut_ty.ty);
                    s.print_type_bounds(" +", &bounds);
                    s.pclose()
                });
                err.span_suggestion(
                    sum_span,
                    "try adding parentheses",
                    sum_with_parens,
                    Applicability::MachineApplicable,
                );
            }
            TyKind::Ptr(..) | TyKind::BareFn(..) => {
                err.span_label(sum_span, "perhaps you forgot parentheses?");
            }
            _ => {
                err.span_label(sum_span, "expected a path");
            }
        }
        err.emit();
        Ok(())
    }

    /// Tries to recover from associated item paths like `[T]::AssocItem` / `(T, U)::AssocItem`.
    /// Attempts to convert the base expression/pattern/type into a type, parses the `::AssocItem`
    /// tail, and combines them into a `<Ty>::AssocItem` expression/pattern/type.
    pub(super) fn maybe_recover_from_bad_qpath<T: RecoverQPath>(
        &mut self,
        base: P<T>,
        allow_recovery: bool,
    ) -> PResult<'a, P<T>> {
        // Do not add `::` to expected tokens.
        if allow_recovery && self.token == token::ModSep {
            if let Some(ty) = base.to_ty() {
                return self.maybe_recover_from_bad_qpath_stage_2(ty.span, ty);
            }
        }
        Ok(base)
    }

    /// Given an already parsed `Ty`, parses the `::AssocItem` tail and
    /// combines them into a `<Ty>::AssocItem` expression/pattern/type.
    pub(super) fn maybe_recover_from_bad_qpath_stage_2<T: RecoverQPath>(
        &mut self,
        ty_span: Span,
        ty: P<Ty>,
    ) -> PResult<'a, P<T>> {
        self.expect(&token::ModSep)?;

        let mut path = ast::Path { segments: Vec::new(), span: DUMMY_SP, tokens: None };
        self.parse_path_segments(&mut path.segments, T::PATH_STYLE, None)?;
        path.span = ty_span.to(self.prev_token.span);

        let ty_str = self.span_to_snippet(ty_span).unwrap_or_else(|_| pprust::ty_to_string(&ty));
        self.struct_span_err(path.span, "missing angle brackets in associated item path")
            .span_suggestion(
                // This is a best-effort recovery.
                path.span,
                "try",
                format!("<{}>::{}", ty_str, pprust::path_to_string(&path)),
                Applicability::MaybeIncorrect,
            )
            .emit();

        let path_span = ty_span.shrink_to_hi(); // Use an empty path since `position == 0`.
        Ok(P(T::recovered(Some(QSelf { ty, path_span, position: 0 }), path)))
    }

    pub fn maybe_consume_incorrect_semicolon(&mut self, items: &[P<Item>]) -> bool {
        if self.eat(&token::Semi) {
            let mut err = self.struct_span_err(self.prev_token.span, "expected item, found `;`");
            err.span_suggestion_short(
                self.prev_token.span,
                "remove this semicolon",
                String::new(),
                Applicability::MachineApplicable,
            );
            if !items.is_empty() {
                let previous_item = &items[items.len() - 1];
                let previous_item_kind_name = match previous_item.kind {
                    // Say "braced struct" because tuple-structs and
                    // braceless-empty-struct declarations do take a semicolon.
                    ItemKind::Struct(..) => Some("braced struct"),
                    ItemKind::Enum(..) => Some("enum"),
                    ItemKind::Trait(..) => Some("trait"),
                    ItemKind::Union(..) => Some("union"),
                    _ => None,
                };
                if let Some(name) = previous_item_kind_name {
                    err.help(&format!("{} declarations are not followed by a semicolon", name));
                }
            }
            err.emit();
            true
        } else {
            false
        }
    }

    /// Creates a `DiagnosticBuilder` for an unexpected token `t` and tries to recover if it is a
    /// closing delimiter.
    pub(super) fn unexpected_try_recover(
        &mut self,
        t: &TokenKind,
    ) -> PResult<'a, bool /* recovered */> {
        let token_str = pprust::token_kind_to_string(t);
        let this_token_str = super::token_descr(&self.token);
        let (prev_sp, sp) = match (&self.token.kind, self.subparser_name) {
            // Point at the end of the macro call when reaching end of macro arguments.
            (token::Eof, Some(_)) => {
                let sp = self.sess.source_map().next_point(self.prev_token.span);
                (sp, sp)
            }
            // We don't want to point at the following span after DUMMY_SP.
            // This happens when the parser finds an empty TokenStream.
            _ if self.prev_token.span == DUMMY_SP => (self.token.span, self.token.span),
            // EOF, don't want to point at the following char, but rather the last token.
            (token::Eof, None) => (self.prev_token.span, self.token.span),
            _ => (self.prev_token.span.shrink_to_hi(), self.token.span),
        };
        let msg = format!(
            "expected `{}`, found {}",
            token_str,
            match (&self.token.kind, self.subparser_name) {
                (token::Eof, Some(origin)) => format!("end of {}", origin),
                _ => this_token_str,
            },
        );
        let mut err = self.struct_span_err(sp, &msg);
        let label_exp = format!("expected `{}`", token_str);
        match self.recover_closing_delimiter(&[t.clone()], err) {
            Err(e) => err = e,
            Ok(recovered) => {
                return Ok(recovered);
            }
        }
        let sm = self.sess.source_map();
        if !sm.is_multiline(prev_sp.until(sp)) {
            // When the spans are in the same line, it means that the only content
            // between them is whitespace, point only at the found token.
            err.span_label(sp, label_exp);
        } else {
            err.span_label(prev_sp, label_exp);
            err.span_label(sp, "unexpected token");
        }
        Err(err)
    }

    pub(super) fn expect_semi(&mut self) -> PResult<'a, ()> {
        if self.eat(&token::Semi) {
            return Ok(());
        }
        self.expect(&token::Semi).map(drop) // Error unconditionally
    }

    /// Consumes alternative await syntaxes like `await!(<expr>)`, `await <expr>`,
    /// `await? <expr>`, `await(<expr>)`, and `await { <expr> }`.
    pub(super) fn recover_incorrect_await_syntax(
        &mut self,
        lo: Span,
        await_sp: Span,
        attrs: AttrVec,
    ) -> PResult<'a, P<Expr>> {
        let (hi, expr, is_question) = if self.token == token::Not {
            // Handle `await!(<expr>)`.
            self.recover_await_macro()?
        } else {
            self.recover_await_prefix(await_sp)?
        };
        let sp = self.error_on_incorrect_await(lo, hi, &expr, is_question);
        let kind = match expr.kind {
            // Avoid knock-down errors as we don't know whether to interpret this as `foo().await?`
            // or `foo()?.await` (the very reason we went with postfix syntax 😅).
            ExprKind::Try(_) => ExprKind::Err,
            _ => ExprKind::Await(expr),
        };
        let expr = self.mk_expr(lo.to(sp), kind, attrs);
        self.maybe_recover_from_bad_qpath(expr, true)
    }

    fn recover_await_macro(&mut self) -> PResult<'a, (Span, P<Expr>, bool)> {
        self.expect(&token::Not)?;
        self.expect(&token::OpenDelim(token::Paren))?;
        let expr = self.parse_expr()?;
        self.expect(&token::CloseDelim(token::Paren))?;
        Ok((self.prev_token.span, expr, false))
    }

    fn recover_await_prefix(&mut self, await_sp: Span) -> PResult<'a, (Span, P<Expr>, bool)> {
        let is_question = self.eat(&token::Question); // Handle `await? <expr>`.
        let expr = if self.token == token::OpenDelim(token::Brace) {
            // Handle `await { <expr> }`.
            // This needs to be handled separately from the next arm to avoid
            // interpreting `await { <expr> }?` as `<expr>?.await`.
            self.parse_block_expr(None, self.token.span, BlockCheckMode::Default, AttrVec::new())
        } else {
            self.parse_expr()
        }
        .map_err(|mut err| {
            err.span_label(await_sp, "while parsing this incorrect await expression");
            err
        })?;
        Ok((expr.span, expr, is_question))
    }

    fn error_on_incorrect_await(&self, lo: Span, hi: Span, expr: &Expr, is_question: bool) -> Span {
        let expr_str =
            self.span_to_snippet(expr.span).unwrap_or_else(|_| pprust::expr_to_string(&expr));
        let suggestion = format!("{}.await{}", expr_str, if is_question { "?" } else { "" });
        let sp = lo.to(hi);
        let app = match expr.kind {
            ExprKind::Try(_) => Applicability::MaybeIncorrect, // `await <expr>?`
            _ => Applicability::MachineApplicable,
        };
        self.struct_span_err(sp, "incorrect use of `await`")
            .span_suggestion(sp, "`await` is a postfix operation", suggestion, app)
            .emit();
        sp
    }

    /// If encountering `future.await()`, consumes and emits an error.
    pub(super) fn recover_from_await_method_call(&mut self) {
        if self.token == token::OpenDelim(token::Paren)
            && self.look_ahead(1, |t| t == &token::CloseDelim(token::Paren))
        {
            // future.await()
            let lo = self.token.span;
            self.bump(); // (
            let sp = lo.to(self.token.span);
            self.bump(); // )
            self.struct_span_err(sp, "incorrect use of `await`")
                .span_suggestion(
                    sp,
                    "`await` is not a method call, remove the parentheses",
                    String::new(),
                    Applicability::MachineApplicable,
                )
                .emit();
        }
    }

    pub(super) fn try_macro_suggestion(&mut self) -> PResult<'a, P<Expr>> {
        let is_try = self.token.is_keyword(kw::Try);
        let is_questionmark = self.look_ahead(1, |t| t == &token::Not); //check for !
        let is_open = self.look_ahead(2, |t| t == &token::OpenDelim(token::Paren)); //check for (

        if is_try && is_questionmark && is_open {
            let lo = self.token.span;
            self.bump(); //remove try
            self.bump(); //remove !
            let try_span = lo.to(self.token.span); //we take the try!( span
            self.bump(); //remove (
            let is_empty = self.token == token::CloseDelim(token::Paren); //check if the block is empty
            self.consume_block(token::Paren, ConsumeClosingDelim::No); //eat the block
            let hi = self.token.span;
            self.bump(); //remove )
            let mut err = self.struct_span_err(lo.to(hi), "use of deprecated `try` macro");
            err.note("in the 2018 edition `try` is a reserved keyword, and the `try!()` macro is deprecated");
            let prefix = if is_empty { "" } else { "alternatively, " };
            if !is_empty {
                err.multipart_suggestion(
                    "you can use the `?` operator instead",
                    vec![(try_span, "".to_owned()), (hi, "?".to_owned())],
                    Applicability::MachineApplicable,
                );
            }
            err.span_suggestion(lo.shrink_to_lo(), &format!("{}you can still access the deprecated `try!()` macro using the \"raw identifier\" syntax", prefix), "r#".to_string(), Applicability::MachineApplicable);
            err.emit();
            Ok(self.mk_expr_err(lo.to(hi)))
        } else {
            Err(self.expected_expression_found()) // The user isn't trying to invoke the try! macro
        }
    }

    /// Recovers a situation like `for ( $pat in $expr )`
    /// and suggest writing `for $pat in $expr` instead.
    ///
    /// This should be called before parsing the `$block`.
    pub(super) fn recover_parens_around_for_head(
        &mut self,
        pat: P<Pat>,
        begin_paren: Option<Span>,
    ) -> P<Pat> {
        match (&self.token.kind, begin_paren) {
            (token::CloseDelim(token::Paren), Some(begin_par_sp)) => {
                self.bump();

                self.struct_span_err(
                    MultiSpan::from_spans(vec![begin_par_sp, self.prev_token.span]),
                    "unexpected parentheses surrounding `for` loop head",
                )
                .multipart_suggestion(
                    "remove parentheses in `for` loop",
                    vec![(begin_par_sp, String::new()), (self.prev_token.span, String::new())],
                    // With e.g. `for (x) in y)` this would replace `(x) in y)`
                    // with `x) in y)` which is syntactically invalid.
                    // However, this is prevented before we get here.
                    Applicability::MachineApplicable,
                )
                .emit();

                // Unwrap `(pat)` into `pat` to avoid the `unused_parens` lint.
                pat.and_then(|pat| match pat.kind {
                    PatKind::Paren(pat) => pat,
                    _ => P(pat),
                })
            }
            _ => pat,
        }
    }

    pub(super) fn could_ascription_be_path(&self, node: &ast::ExprKind) -> bool {
        (self.token == token::Lt && // `foo:<bar`, likely a typoed turbofish.
            self.look_ahead(1, |t| t.is_ident() && !t.is_reserved_ident()))
            || self.token.is_ident() &&
            matches!(node, ast::ExprKind::Path(..) | ast::ExprKind::Field(..)) &&
            !self.token.is_reserved_ident() &&           // v `foo:bar(baz)`
            self.look_ahead(1, |t| t == &token::OpenDelim(token::Paren))
            || self.look_ahead(1, |t| t == &token::OpenDelim(token::Brace)) // `foo:bar {`
            || self.look_ahead(1, |t| t == &token::Colon) &&     // `foo:bar::<baz`
            self.look_ahead(2, |t| t == &token::Lt) &&
            self.look_ahead(3, |t| t.is_ident())
            || self.look_ahead(1, |t| t == &token::Colon) &&  // `foo:bar:baz`
            self.look_ahead(2, |t| t.is_ident())
            || self.look_ahead(1, |t| t == &token::ModSep)
                && (self.look_ahead(2, |t| t.is_ident()) ||   // `foo:bar::baz`
            self.look_ahead(2, |t| t == &token::Lt)) // `foo:bar::<baz>`
    }

    pub(super) fn recover_seq_parse_error(
        &mut self,
        delim: token::DelimToken,
        lo: Span,
        result: PResult<'a, P<Expr>>,
    ) -> P<Expr> {
        match result {
            Ok(x) => x,
            Err(mut err) => {
                err.emit();
                // Recover from parse error, callers expect the closing delim to be consumed.
                self.consume_block(delim, ConsumeClosingDelim::Yes);
                self.mk_expr(lo.to(self.prev_token.span), ExprKind::Err, AttrVec::new())
            }
        }
    }

    pub(super) fn recover_closing_delimiter(
        &mut self,
        tokens: &[TokenKind],
        mut err: DiagnosticBuilder<'a>,
    ) -> PResult<'a, bool> {
        let mut pos = None;
        // We want to use the last closing delim that would apply.
        for (i, unmatched) in self.unclosed_delims.iter().enumerate().rev() {
            if tokens.contains(&token::CloseDelim(unmatched.expected_delim))
                && Some(self.token.span) > unmatched.unclosed_span
            {
                pos = Some(i);
            }
        }
        match pos {
            Some(pos) => {
                // Recover and assume that the detected unclosed delimiter was meant for
                // this location. Emit the diagnostic and act as if the delimiter was
                // present for the parser's sake.

                // Don't attempt to recover from this unclosed delimiter more than once.
                let unmatched = self.unclosed_delims.remove(pos);
                let delim = TokenType::Token(token::CloseDelim(unmatched.expected_delim));
                if unmatched.found_delim.is_none() {
                    // We encountered `Eof`, set this fact here to avoid complaining about missing
                    // `fn main()` when we found place to suggest the closing brace.
                    *self.sess.reached_eof.borrow_mut() = true;
                }

                // We want to suggest the inclusion of the closing delimiter where it makes
                // the most sense, which is immediately after the last token:
                //
                //  {foo(bar {}}
                //      ^      ^
                //      |      |
                //      |      help: `)` may belong here
                //      |
                //      unclosed delimiter
                if let Some(sp) = unmatched.unclosed_span {
                    let mut primary_span: Vec<Span> =
                        err.span.primary_spans().iter().cloned().collect();
                    primary_span.push(sp);
                    let mut primary_span: MultiSpan = primary_span.into();
                    for span_label in err.span.span_labels() {
                        if let Some(label) = span_label.label {
                            primary_span.push_span_label(span_label.span, label);
                        }
                    }
                    err.set_span(primary_span);
                    err.span_label(sp, "unclosed delimiter");
                }
                // Backticks should be removed to apply suggestions.
                let mut delim = delim.to_string();
                delim.retain(|c| c != '`');
                err.span_suggestion_short(
                    self.prev_token.span.shrink_to_hi(),
                    &format!("`{}` may belong here", delim),
                    delim,
                    Applicability::MaybeIncorrect,
                );
                if unmatched.found_delim.is_none() {
                    // Encountered `Eof` when lexing blocks. Do not recover here to avoid knockdown
                    // errors which would be emitted elsewhere in the parser and let other error
                    // recovery consume the rest of the file.
                    Err(err)
                } else {
                    err.emit();
                    self.expected_tokens.clear(); // Reduce the number of errors.
                    Ok(true)
                }
            }
            _ => Err(err),
        }
    }

    /// Eats tokens until we can be relatively sure we reached the end of the
    /// statement. This is something of a best-effort heuristic.
    ///
    /// We terminate when we find an unmatched `}` (without consuming it).
    pub(super) fn recover_stmt(&mut self) {
        self.recover_stmt_(SemiColonMode::Ignore, BlockMode::Ignore)
    }

    /// If `break_on_semi` is `Break`, then we will stop consuming tokens after
    /// finding (and consuming) a `;` outside of `{}` or `[]` (note that this is
    /// approximate -- it can mean we break too early due to macros, but that
    /// should only lead to sub-optimal recovery, not inaccurate parsing).
    ///
    /// If `break_on_block` is `Break`, then we will stop consuming tokens
    /// after finding (and consuming) a brace-delimited block.
    pub(super) fn recover_stmt_(
        &mut self,
        break_on_semi: SemiColonMode,
        break_on_block: BlockMode,
    ) {
        let mut brace_depth = 0;
        let mut bracket_depth = 0;
        let mut in_block = false;
        debug!("recover_stmt_ enter loop (semi={:?}, block={:?})", break_on_semi, break_on_block);
        loop {
            debug!("recover_stmt_ loop {:?}", self.token);
            match self.token.kind {
                token::OpenDelim(token::DelimToken::Brace) => {
                    brace_depth += 1;
                    self.bump();
                    if break_on_block == BlockMode::Break && brace_depth == 1 && bracket_depth == 0
                    {
                        in_block = true;
                    }
                }
                token::OpenDelim(token::DelimToken::Bracket) => {
                    bracket_depth += 1;
                    self.bump();
                }
                token::CloseDelim(token::DelimToken::Brace) => {
                    if brace_depth == 0 {
                        debug!("recover_stmt_ return - close delim {:?}", self.token);
                        break;
                    }
                    brace_depth -= 1;
                    self.bump();
                    if in_block && bracket_depth == 0 && brace_depth == 0 {
                        debug!("recover_stmt_ return - block end {:?}", self.token);
                        break;
                    }
                }
                token::CloseDelim(token::DelimToken::Bracket) => {
                    bracket_depth -= 1;
                    if bracket_depth < 0 {
                        bracket_depth = 0;
                    }
                    self.bump();
                }
                token::Eof => {
                    debug!("recover_stmt_ return - Eof");
                    break;
                }
                token::Semi => {
                    self.bump();
                    if break_on_semi == SemiColonMode::Break
                        && brace_depth == 0
                        && bracket_depth == 0
                    {
                        debug!("recover_stmt_ return - Semi");
                        break;
                    }
                }
                token::Comma
                    if break_on_semi == SemiColonMode::Comma
                        && brace_depth == 0
                        && bracket_depth == 0 =>
                {
                    debug!("recover_stmt_ return - Semi");
                    break;
                }
                _ => self.bump(),
            }
        }
    }

    pub(super) fn check_for_for_in_in_typo(&mut self, in_span: Span) {
        if self.eat_keyword(kw::In) {
            // a common typo: `for _ in in bar {}`
            self.struct_span_err(self.prev_token.span, "expected iterable, found keyword `in`")
                .span_suggestion_short(
                    in_span.until(self.prev_token.span),
                    "remove the duplicated `in`",
                    String::new(),
                    Applicability::MachineApplicable,
                )
                .emit();
        }
    }

    pub(super) fn eat_incorrect_doc_comment_for_param_type(&mut self) {
        if let token::DocComment(..) = self.token.kind {
            self.struct_span_err(
                self.token.span,
                "documentation comments cannot be applied to a function parameter's type",
            )
            .span_label(self.token.span, "doc comments are not allowed here")
            .emit();
            self.bump();
        } else if self.token == token::Pound
            && self.look_ahead(1, |t| *t == token::OpenDelim(token::Bracket))
        {
            let lo = self.token.span;
            // Skip every token until next possible arg.
            while self.token != token::CloseDelim(token::Bracket) {
                self.bump();
            }
            let sp = lo.to(self.token.span);
            self.bump();
            self.struct_span_err(sp, "attributes cannot be applied to a function parameter's type")
                .span_label(sp, "attributes are not allowed here")
                .emit();
        }
    }

    pub(super) fn parameter_without_type(
        &mut self,
        err: &mut DiagnosticBuilder<'_>,
        pat: P<ast::Pat>,
        require_name: bool,
        first_param: bool,
    ) -> Option<Ident> {
        // If we find a pattern followed by an identifier, it could be an (incorrect)
        // C-style parameter declaration.
        if self.check_ident()
            && self.look_ahead(1, |t| *t == token::Comma || *t == token::CloseDelim(token::Paren))
        {
            // `fn foo(String s) {}`
            let ident = self.parse_ident().unwrap();
            let span = pat.span.with_hi(ident.span.hi());

            err.span_suggestion(
                span,
                "declare the type after the parameter binding",
                String::from("<identifier>: <type>"),
                Applicability::HasPlaceholders,
            );
            return Some(ident);
        } else if require_name
            && (self.token == token::Comma
                || self.token == token::Lt
                || self.token == token::CloseDelim(token::Paren))
        {
            let rfc_note = "anonymous parameters are removed in the 2018 edition (see RFC 1685)";

            let (ident, self_sugg, param_sugg, type_sugg, self_span, param_span, type_span) =
                match pat.kind {
                    PatKind::Ident(_, ident, _) => (
                        ident,
                        "self: ".to_string(),
                        ": TypeName".to_string(),
                        "_: ".to_string(),
                        pat.span.shrink_to_lo(),
                        pat.span.shrink_to_hi(),
                        pat.span.shrink_to_lo(),
                    ),
                    // Also catches `fn foo(&a)`.
                    PatKind::Ref(ref inner_pat, mutab)
                        if matches!(inner_pat.clone().into_inner().kind, PatKind::Ident(..)) =>
                    {
                        match inner_pat.clone().into_inner().kind {
                            PatKind::Ident(_, ident, _) => {
                                let mutab = mutab.prefix_str();
                                (
                                    ident,
                                    "self: ".to_string(),
                                    format!("{}: &{}TypeName", ident, mutab),
                                    "_: ".to_string(),
                                    pat.span.shrink_to_lo(),
                                    pat.span,
                                    pat.span.shrink_to_lo(),
                                )
                            }
                            _ => unreachable!(),
                        }
                    }
                    _ => {
                        // Otherwise, try to get a type and emit a suggestion.
                        if let Some(ty) = pat.to_ty() {
                            err.span_suggestion_verbose(
                                pat.span,
                                "explicitly ignore the parameter name",
                                format!("_: {}", pprust::ty_to_string(&ty)),
                                Applicability::MachineApplicable,
                            );
                            err.note(rfc_note);
                        }

                        return None;
                    }
                };

            // `fn foo(a, b) {}`, `fn foo(a<x>, b<y>) {}` or `fn foo(usize, usize) {}`
            if first_param {
                err.span_suggestion(
                    self_span,
                    "if this is a `self` type, give it a parameter name",
                    self_sugg,
                    Applicability::MaybeIncorrect,
                );
            }
            // Avoid suggesting that `fn foo(HashMap<u32>)` is fixed with a change to
            // `fn foo(HashMap: TypeName<u32>)`.
            if self.token != token::Lt {
                err.span_suggestion(
                    param_span,
                    "if this is a parameter name, give it a type",
                    param_sugg,
                    Applicability::HasPlaceholders,
                );
            }
            err.span_suggestion(
                type_span,
                "if this is a type, explicitly ignore the parameter name",
                type_sugg,
                Applicability::MachineApplicable,
            );
            err.note(rfc_note);

            // Don't attempt to recover by using the `X` in `X<Y>` as the parameter name.
            return if self.token == token::Lt { None } else { Some(ident) };
        }
        None
    }

    pub(super) fn recover_arg_parse(&mut self) -> PResult<'a, (P<ast::Pat>, P<ast::Ty>)> {
        let pat = self.parse_pat_no_top_alt(Some("argument name"))?;
        self.expect(&token::Colon)?;
        let ty = self.parse_ty()?;

        struct_span_err!(
            self.diagnostic(),
            pat.span,
            E0642,
            "patterns aren't allowed in methods without bodies",
        )
        .span_suggestion_short(
            pat.span,
            "give this argument a name or use an underscore to ignore it",
            "_".to_owned(),
            Applicability::MachineApplicable,
        )
        .emit();

        // Pretend the pattern is `_`, to avoid duplicate errors from AST validation.
        let pat =
            P(Pat { kind: PatKind::Wild, span: pat.span, id: ast::DUMMY_NODE_ID, tokens: None });
        Ok((pat, ty))
    }

    pub(super) fn recover_bad_self_param(&mut self, mut param: Param) -> PResult<'a, Param> {
        let sp = param.pat.span;
        param.ty.kind = TyKind::Err;
        self.struct_span_err(sp, "unexpected `self` parameter in function")
            .span_label(sp, "must be the first parameter of an associated function")
            .emit();
        Ok(param)
    }

    pub(super) fn consume_block(
        &mut self,
        delim: token::DelimToken,
        consume_close: ConsumeClosingDelim,
    ) {
        let mut brace_depth = 0;
        loop {
            if self.eat(&token::OpenDelim(delim)) {
                brace_depth += 1;
            } else if self.check(&token::CloseDelim(delim)) {
                if brace_depth == 0 {
                    if let ConsumeClosingDelim::Yes = consume_close {
                        // Some of the callers of this method expect to be able to parse the
                        // closing delimiter themselves, so we leave it alone. Otherwise we advance
                        // the parser.
                        self.bump();
                    }
                    return;
                } else {
                    self.bump();
                    brace_depth -= 1;
                    continue;
                }
            } else if self.token == token::Eof || self.eat(&token::CloseDelim(token::NoDelim)) {
                return;
            } else {
                self.bump();
            }
        }
    }

    pub(super) fn expected_expression_found(&self) -> DiagnosticBuilder<'a> {
        let (span, msg) = match (&self.token.kind, self.subparser_name) {
            (&token::Eof, Some(origin)) => {
                let sp = self.sess.source_map().next_point(self.prev_token.span);
                (sp, format!("expected expression, found end of {}", origin))
            }
            _ => (
                self.token.span,
                format!("expected expression, found {}", super::token_descr(&self.token),),
            ),
        };
        let mut err = self.struct_span_err(span, &msg);
        let sp = self.sess.source_map().start_point(self.token.span);
        if let Some(sp) = self.sess.ambiguous_block_expr_parse.borrow().get(&sp) {
            self.sess.expr_parentheses_needed(&mut err, *sp);
        }
        err.span_label(span, "expected expression");
        err
    }

    fn consume_tts(
        &mut self,
        mut acc: i64, // `i64` because malformed code can have more closing delims than opening.
        // Not using `FxHashMap` due to `token::TokenKind: !Eq + !Hash`.
        modifier: &[(token::TokenKind, i64)],
    ) {
        while acc > 0 {
            if let Some((_, val)) = modifier.iter().find(|(t, _)| *t == self.token.kind) {
                acc += *val;
            }
            if self.token.kind == token::Eof {
                break;
            }
            self.bump();
        }
    }

    /// Replace duplicated recovered parameters with `_` pattern to avoid unnecessary errors.
    ///
    /// This is necessary because at this point we don't know whether we parsed a function with
    /// anonymous parameters or a function with names but no types. In order to minimize
    /// unnecessary errors, we assume the parameters are in the shape of `fn foo(a, b, c)` where
    /// the parameters are *names* (so we don't emit errors about not being able to find `b` in
    /// the local scope), but if we find the same name multiple times, like in `fn foo(i8, i8)`,
    /// we deduplicate them to not complain about duplicated parameter names.
    pub(super) fn deduplicate_recovered_params_names(&self, fn_inputs: &mut Vec<Param>) {
        let mut seen_inputs = FxHashSet::default();
        for input in fn_inputs.iter_mut() {
            let opt_ident = if let (PatKind::Ident(_, ident, _), TyKind::Err) =
                (&input.pat.kind, &input.ty.kind)
            {
                Some(*ident)
            } else {
                None
            };
            if let Some(ident) = opt_ident {
                if seen_inputs.contains(&ident) {
                    input.pat.kind = PatKind::Wild;
                }
                seen_inputs.insert(ident);
            }
        }
    }

    /// Handle encountering a symbol in a generic argument list that is not a `,` or `>`. In this
    /// case, we emit an error and try to suggest enclosing a const argument in braces if it looks
    /// like the user has forgotten them.
    pub fn handle_ambiguous_unbraced_const_arg(
        &mut self,
        args: &mut Vec<AngleBracketedArg>,
    ) -> PResult<'a, bool> {
        // If we haven't encountered a closing `>`, then the argument is malformed.
        // It's likely that the user has written a const expression without enclosing it
        // in braces, so we try to recover here.
        let arg = args.pop().unwrap();
        // FIXME: for some reason using `unexpected` or `expected_one_of_not_found` has
        // adverse side-effects to subsequent errors and seems to advance the parser.
        // We are causing this error here exclusively in case that a `const` expression
        // could be recovered from the current parser state, even if followed by more
        // arguments after a comma.
        let mut err = self.struct_span_err(
            self.token.span,
            &format!("expected one of `,` or `>`, found {}", super::token_descr(&self.token)),
        );
        err.span_label(self.token.span, "expected one of `,` or `>`");
        match self.recover_const_arg(arg.span(), err) {
            Ok(arg) => {
                args.push(AngleBracketedArg::Arg(arg));
                if self.eat(&token::Comma) {
                    return Ok(true); // Continue
                }
            }
            Err(mut err) => {
                args.push(arg);
                // We will emit a more generic error later.
                err.delay_as_bug();
            }
        }
        return Ok(false); // Don't continue.
    }

    /// Attempt to parse a generic const argument that has not been enclosed in braces.
    /// There are a limited number of expressions that are permitted without being encoded
    /// in braces:
    /// - Literals.
    /// - Single-segment paths (i.e. standalone generic const parameters).
    /// All other expressions that can be parsed will emit an error suggesting the expression be
    /// wrapped in braces.
    pub fn handle_unambiguous_unbraced_const_arg(&mut self) -> PResult<'a, P<Expr>> {
        let start = self.token.span;
        let expr = self.parse_expr_res(Restrictions::CONST_EXPR, None).map_err(|mut err| {
            err.span_label(
                start.shrink_to_lo(),
                "while parsing a const generic argument starting here",
            );
            err
        })?;
        if !self.expr_is_valid_const_arg(&expr) {
            self.struct_span_err(
                expr.span,
                "expressions must be enclosed in braces to be used as const generic \
                    arguments",
            )
            .multipart_suggestion(
                "enclose the `const` expression in braces",
                vec![
                    (expr.span.shrink_to_lo(), "{ ".to_string()),
                    (expr.span.shrink_to_hi(), " }".to_string()),
                ],
                Applicability::MachineApplicable,
            )
            .emit();
        }
        Ok(expr)
    }

    fn recover_const_param_decl(
        &mut self,
        ty_generics: Option<&Generics>,
    ) -> PResult<'a, Option<GenericArg>> {
        let snapshot = self.clone();
        let param = match self.parse_const_param(vec![]) {
            Ok(param) => param,
            Err(mut err) => {
                err.cancel();
                *self = snapshot;
                return Err(err);
            }
        };
        let mut err =
            self.struct_span_err(param.span(), "unexpected `const` parameter declaration");
        err.span_label(param.span(), "expected a `const` expression, not a parameter declaration");
        if let (Some(generics), Ok(snippet)) =
            (ty_generics, self.sess.source_map().span_to_snippet(param.span()))
        {
            let (span, sugg) = match &generics.params[..] {
                [] => (generics.span, format!("<{}>", snippet)),
                [.., generic] => (generic.span().shrink_to_hi(), format!(", {}", snippet)),
            };
            err.multipart_suggestion(
                "`const` parameters must be declared for the `impl`",
                vec![(span, sugg), (param.span(), param.ident.to_string())],
                Applicability::MachineApplicable,
            );
        }
        let value = self.mk_expr_err(param.span());
        err.emit();
        return Ok(Some(GenericArg::Const(AnonConst { id: ast::DUMMY_NODE_ID, value })));
    }

    pub fn recover_const_param_declaration(
        &mut self,
        ty_generics: Option<&Generics>,
    ) -> PResult<'a, Option<GenericArg>> {
        // We have to check for a few different cases.
        if let Ok(arg) = self.recover_const_param_decl(ty_generics) {
            return Ok(arg);
        }

        // We haven't consumed `const` yet.
        let start = self.token.span;
        self.bump(); // `const`

        // Detect and recover from the old, pre-RFC2000 syntax for const generics.
        let mut err = self
            .struct_span_err(start, "expected lifetime, type, or constant, found keyword `const`");
        if self.check_const_arg() {
            err.span_suggestion_verbose(
                start.until(self.token.span),
                "the `const` keyword is only needed in the definition of the type",
                String::new(),
                Applicability::MaybeIncorrect,
            );
            err.emit();
            Ok(Some(GenericArg::Const(self.parse_const_arg()?)))
        } else {
            let after_kw_const = self.token.span;
            self.recover_const_arg(after_kw_const, err).map(Some)
        }
    }

    /// Try to recover from possible generic const argument without `{` and `}`.
    ///
    /// When encountering code like `foo::< bar + 3 >` or `foo::< bar - baz >` we suggest
    /// `foo::<{ bar + 3 }>` and `foo::<{ bar - baz }>`, respectively. We only provide a suggestion
    /// if we think that that the resulting expression would be well formed.
    pub fn recover_const_arg(
        &mut self,
        start: Span,
        mut err: DiagnosticBuilder<'a>,
    ) -> PResult<'a, GenericArg> {
        let is_op = AssocOp::from_token(&self.token)
            .and_then(|op| {
                if let AssocOp::Greater
                | AssocOp::Less
                | AssocOp::ShiftRight
                | AssocOp::GreaterEqual
                // Don't recover from `foo::<bar = baz>`, because this could be an attempt to
                // assign a value to a defaulted generic parameter.
                | AssocOp::Assign
                | AssocOp::AssignOp(_) = op
                {
                    None
                } else {
                    Some(op)
                }
            })
            .is_some();
        // This will be true when a trait object type `Foo +` or a path which was a `const fn` with
        // type params has been parsed.
        let was_op =
            matches!(self.prev_token.kind, token::BinOp(token::Plus | token::Shr) | token::Gt);
        if !is_op && !was_op {
            // We perform these checks and early return to avoid taking a snapshot unnecessarily.
            return Err(err);
        }
        let snapshot = self.clone();
        if is_op {
            self.bump();
        }
        match self.parse_expr_res(Restrictions::CONST_EXPR, None) {
            Ok(expr) => {
                // Find a mistake like `MyTrait<Assoc == S::Assoc>`.
                if token::EqEq == snapshot.token.kind {
                    err.span_suggestion(
                        snapshot.token.span,
                        "if you meant to use an associated type binding, replace `==` with `=`",
                        "=".to_string(),
                        Applicability::MaybeIncorrect,
                    );
                    let value = self.mk_expr_err(start.to(expr.span));
                    err.emit();
                    return Ok(GenericArg::Const(AnonConst { id: ast::DUMMY_NODE_ID, value }));
                } else if token::Comma == self.token.kind || self.token.kind.should_end_const_arg()
                {
                    // Avoid the following output by checking that we consumed a full const arg:
                    // help: expressions must be enclosed in braces to be used as const generic
                    //       arguments
                    //    |
                    // LL |     let sr: Vec<{ (u32, _, _) = vec![] };
                    //    |                 ^                      ^
                    err.multipart_suggestion(
                        "expressions must be enclosed in braces to be used as const generic \
                         arguments",
                        vec![
                            (start.shrink_to_lo(), "{ ".to_string()),
                            (expr.span.shrink_to_hi(), " }".to_string()),
                        ],
                        Applicability::MaybeIncorrect,
                    );
                    let value = self.mk_expr_err(start.to(expr.span));
                    err.emit();
                    return Ok(GenericArg::Const(AnonConst { id: ast::DUMMY_NODE_ID, value }));
                }
            }
            Err(mut err) => {
                err.cancel();
            }
        }
        *self = snapshot;
        Err(err)
    }

    /// Get the diagnostics for the cases where `move async` is found.
    ///
    /// `move_async_span` starts at the 'm' of the move keyword and ends with the 'c' of the async keyword
    pub(super) fn incorrect_move_async_order_found(
        &self,
        move_async_span: Span,
    ) -> DiagnosticBuilder<'a> {
        let mut err =
            self.struct_span_err(move_async_span, "the order of `move` and `async` is incorrect");
        err.span_suggestion_verbose(
            move_async_span,
            "try switching the order",
            "async move".to_owned(),
            Applicability::MaybeIncorrect,
        );
        err
    }

    /// Some special error handling for the "top-level" patterns in a match arm,
    /// `for` loop, `let`, &c. (in contrast to subpatterns within such).
    crate fn maybe_recover_colon_colon_in_pat_typo(
        &mut self,
        mut first_pat: P<Pat>,
        ra: RecoverColon,
        expected: Expected,
    ) -> P<Pat> {
        if RecoverColon::Yes != ra || token::Colon != self.token.kind {
            return first_pat;
        }
        if !matches!(first_pat.kind, PatKind::Ident(_, _, None) | PatKind::Path(..))
            || !self.look_ahead(1, |token| token.is_ident() && !token.is_reserved_ident())
        {
            return first_pat;
        }
        // The pattern looks like it might be a path with a `::` -> `:` typo:
        // `match foo { bar:baz => {} }`
        let span = self.token.span;
        // We only emit "unexpected `:`" error here if we can successfully parse the
        // whole pattern correctly in that case.
        let snapshot = self.clone();

        // Create error for "unexpected `:`".
        match self.expected_one_of_not_found(&[], &[]) {
            Err(mut err) => {
                self.bump(); // Skip the `:`.
                match self.parse_pat_no_top_alt(expected) {
                    Err(mut inner_err) => {
                        // Carry on as if we had not done anything, callers will emit a
                        // reasonable error.
                        inner_err.cancel();
                        err.cancel();
                        *self = snapshot;
                    }
                    Ok(mut pat) => {
                        // We've parsed the rest of the pattern.
                        let new_span = first_pat.span.to(pat.span);
                        let mut show_sugg = false;
                        // Try to construct a recovered pattern.
                        match &mut pat.kind {
                            PatKind::Struct(qself @ None, path, ..)
                            | PatKind::TupleStruct(qself @ None, path, _)
                            | PatKind::Path(qself @ None, path) => match &first_pat.kind {
                                PatKind::Ident(_, ident, _) => {
                                    path.segments.insert(0, PathSegment::from_ident(ident.clone()));
                                    path.span = new_span;
                                    show_sugg = true;
                                    first_pat = pat;
                                }
                                PatKind::Path(old_qself, old_path) => {
                                    path.segments = old_path
                                        .segments
                                        .iter()
                                        .cloned()
                                        .chain(take(&mut path.segments))
                                        .collect();
                                    path.span = new_span;
                                    *qself = old_qself.clone();
                                    first_pat = pat;
                                    show_sugg = true;
                                }
                                _ => {}
                            },
                            PatKind::Ident(BindingMode::ByValue(Mutability::Not), ident, None) => {
                                match &first_pat.kind {
                                    PatKind::Ident(_, old_ident, _) => {
                                        let path = PatKind::Path(
                                            None,
                                            Path {
                                                span: new_span,
                                                segments: vec![
                                                    PathSegment::from_ident(old_ident.clone()),
                                                    PathSegment::from_ident(ident.clone()),
                                                ],
                                                tokens: None,
                                            },
                                        );
                                        first_pat = self.mk_pat(new_span, path);
                                        show_sugg = true;
                                    }
                                    PatKind::Path(old_qself, old_path) => {
                                        let mut segments = old_path.segments.clone();
                                        segments.push(PathSegment::from_ident(ident.clone()));
                                        let path = PatKind::Path(
                                            old_qself.clone(),
                                            Path { span: new_span, segments, tokens: None },
                                        );
                                        first_pat = self.mk_pat(new_span, path);
                                        show_sugg = true;
                                    }
                                    _ => {}
                                }
                            }
                            _ => {}
                        }
                        if show_sugg {
                            err.span_suggestion(
                                span,
                                "maybe write a path separator here",
                                "::".to_string(),
                                Applicability::MaybeIncorrect,
                            );
                        } else {
                            first_pat = self.mk_pat(new_span, PatKind::Wild);
                        }
                        err.emit();
                    }
                }
            }
            _ => {
                // Carry on as if we had not done anything. This should be unreachable.
                *self = snapshot;
            }
        };
        first_pat
    }

    /// Some special error handling for the "top-level" patterns in a match arm,
    /// `for` loop, `let`, &c. (in contrast to subpatterns within such).
    crate fn maybe_recover_unexpected_comma(
        &mut self,
        lo: Span,
        rc: RecoverComma,
    ) -> PResult<'a, ()> {
        if rc == RecoverComma::No || self.token != token::Comma {
            return Ok(());
        }

        // An unexpected comma after a top-level pattern is a clue that the
        // user (perhaps more accustomed to some other language) forgot the
        // parentheses in what should have been a tuple pattern; return a
        // suggestion-enhanced error here rather than choking on the comma later.
        let comma_span = self.token.span;
        self.bump();
        if let Err(mut err) = self.skip_pat_list() {
            // We didn't expect this to work anyway; we just wanted to advance to the
            // end of the comma-sequence so we know the span to suggest parenthesizing.
            err.cancel();
        }
        let seq_span = lo.to(self.prev_token.span);
        let mut err = self.struct_span_err(comma_span, "unexpected `,` in pattern");
        if let Ok(seq_snippet) = self.span_to_snippet(seq_span) {
            const MSG: &str = "try adding parentheses to match on a tuple...";

            err.span_suggestion(
                seq_span,
                MSG,
                format!("({})", seq_snippet),
                Applicability::MachineApplicable,
            );
            err.span_suggestion(
                seq_span,
                "...or a vertical bar to match on multiple alternatives",
                seq_snippet.replace(",", " |"),
                Applicability::MachineApplicable,
            );
        }
        Err(err)
    }

    /// Parse and throw away a parenthesized comma separated
    /// sequence of patterns until `)` is reached.
    fn skip_pat_list(&mut self) -> PResult<'a, ()> {
        while !self.check(&token::CloseDelim(token::Paren)) {
            self.parse_pat_no_top_alt(None)?;
            if !self.eat(&token::Comma) {
                return Ok(());
            }
        }
        Ok(())
    }
}