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
use rustc_data_structures::fx::FxHashMap;
use rustc_hir::def_id::{DefId, DefIndex};
use rustc_index::vec::{Idx, IndexVec};

use crate::middle::exported_symbols::ExportedSymbol;
use crate::mir::Body;
use crate::ty::{
    self, Clause, Const, FnSig, GeneratorDiagnosticData, GenericPredicates, Predicate, TraitRef, Ty,
};

pub trait ParameterizedOverTcx: 'static {
    #[allow(unused_lifetimes)]
    type Value<'tcx>;
}

impl<T: ParameterizedOverTcx> ParameterizedOverTcx for &'static [T] {
    type Value<'tcx> = &'tcx [T::Value<'tcx>];
}

impl<T: ParameterizedOverTcx> ParameterizedOverTcx for Option<T> {
    type Value<'tcx> = Option<T::Value<'tcx>>;
}

impl<A: ParameterizedOverTcx, B: ParameterizedOverTcx> ParameterizedOverTcx for (A, B) {
    type Value<'tcx> = (A::Value<'tcx>, B::Value<'tcx>);
}

impl<I: Idx + 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for IndexVec<I, T> {
    type Value<'tcx> = IndexVec<I, T::Value<'tcx>>;
}

impl<I: 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for FxHashMap<I, T> {
    type Value<'tcx> = FxHashMap<I, T::Value<'tcx>>;
}

impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::Binder<'static, T> {
    type Value<'tcx> = ty::Binder<'tcx, T::Value<'tcx>>;
}

#[macro_export]
macro_rules! trivially_parameterized_over_tcx {
    ($($ty:ty),+ $(,)?) => {
        $(
            impl $crate::ty::ParameterizedOverTcx for $ty {
                #[allow(unused_lifetimes)]
                type Value<'tcx> = $ty;
            }
        )*
    }
}

trivially_parameterized_over_tcx! {
    usize,
    (),
    u32,
    std::string::String,
    crate::metadata::ModChild,
    crate::middle::codegen_fn_attrs::CodegenFnAttrs,
    crate::middle::exported_symbols::SymbolExportInfo,
    crate::middle::resolve_lifetime::ObjectLifetimeDefault,
    crate::mir::ConstQualifs,
    ty::AssocItemContainer,
    ty::DeducedParamAttrs,
    ty::Generics,
    ty::ImplPolarity,
    ty::ReprOptions,
    ty::TraitDef,
    ty::Visibility<DefIndex>,
    ty::adjustment::CoerceUnsizedInfo,
    ty::fast_reject::SimplifiedTypeGen<DefId>,
    rustc_ast::Attribute,
    rustc_ast::DelimArgs,
    rustc_attr::ConstStability,
    rustc_attr::DefaultBodyStability,
    rustc_attr::Deprecation,
    rustc_attr::Stability,
    rustc_hir::Constness,
    rustc_hir::Defaultness,
    rustc_hir::GeneratorKind,
    rustc_hir::IsAsync,
    rustc_hir::LangItem,
    rustc_hir::def::DefKind,
    rustc_hir::def_id::DefIndex,
    rustc_hir::definitions::DefKey,
    rustc_index::bit_set::BitSet<u32>,
    rustc_index::bit_set::FiniteBitSet<u32>,
    rustc_session::cstore::ForeignModule,
    rustc_session::cstore::LinkagePreference,
    rustc_session::cstore::NativeLib,
    rustc_span::DebuggerVisualizerFile,
    rustc_span::ExpnData,
    rustc_span::ExpnHash,
    rustc_span::ExpnId,
    rustc_span::SourceFile,
    rustc_span::Span,
    rustc_span::Symbol,
    rustc_span::def_id::DefPathHash,
    rustc_span::hygiene::SyntaxContextData,
    rustc_span::symbol::Ident,
    rustc_type_ir::Variance,
}

// HACK(compiler-errors): This macro rule can only take an ident,
// not a path, due to parsing ambiguity reasons. That means we gotta
// import all of these types above.
#[macro_export]
macro_rules! parameterized_over_tcx {
    ($($ident:ident),+ $(,)?) => {
        $(
            impl $crate::ty::ParameterizedOverTcx for $ident<'static> {
                type Value<'tcx> = $ident<'tcx>;
            }
        )*
    }
}

parameterized_over_tcx! {
    Ty,
    FnSig,
    GenericPredicates,
    TraitRef,
    Const,
    Predicate,
    Clause,
    GeneratorDiagnosticData,
    Body,
    ExportedSymbol,
}