rustc_const_eval/check_consts/
ops.rs

Help
1//! Concrete error types for all operations which may be invalid in a certain const context.
2
3use hir::{ConstContext, LangItem};
4use rustc_errors::codes::*;
5use rustc_errors::{Applicability, Diag};
6use rustc_hir as hir;
7use rustc_hir::def_id::DefId;
8use rustc_infer::infer::TyCtxtInferExt;
9use rustc_infer::traits::{ImplSource, Obligation, ObligationCause};
10use rustc_middle::mir::CallSource;
11use rustc_middle::span_bug;
12use rustc_middle::ty::print::{PrintTraitRefExt as _, with_no_trimmed_paths};
13use rustc_middle::ty::{
14    self, Closure, FnDef, FnPtr, GenericArgKind, GenericArgsRef, Param, TraitRef, Ty,
15    suggest_constraining_type_param,
16};
17use rustc_session::parse::add_feature_diagnostics;
18use rustc_span::{BytePos, Pos, Span, Symbol, sym};
19use rustc_trait_selection::error_reporting::traits::call_kind::{
20    CallDesugaringKind, CallKind, call_kind,
21};
22use rustc_trait_selection::traits::SelectionContext;
23use tracing::debug;
24
25use super::ConstCx;
26use crate::{errors, fluent_generated};
27
28#[derive(Clone, Copy, Debug, PartialEq, Eq)]
29pub enum Status {
30    Unstable {
31        /// The feature that must be enabled to use this operation.
32        gate: Symbol,
33        /// Whether the feature gate was already checked (because the logic is a bit more
34        /// complicated than just checking a single gate).
35        gate_already_checked: bool,
36        /// Whether it is allowed to use this operation from stable `const fn`.
37        /// This will usually be `false`.
38        safe_to_expose_on_stable: bool,
39        /// We indicate whether this is a function call, since we can use targeted
40        /// diagnostics for "callee is not safe to expose om stable".
41        is_function_call: bool,
42    },
43    Forbidden,
44}
45
46#[derive(Clone, Copy)]
47pub enum DiagImportance {
48    /// An operation that must be removed for const-checking to pass.
49    Primary,
50
51    /// An operation that causes const-checking to fail, but is usually a side-effect of a `Primary` operation elsewhere.
52    Secondary,
53}
54
55/// An operation that is *not allowed* in a const context.
56pub trait NonConstOp<'tcx>: std::fmt::Debug {
57    /// Returns an enum indicating whether this operation can be enabled with a feature gate.
58    fn status_in_item(&self, _ccx: &ConstCx<'_, 'tcx>) -> Status {
59        Status::Forbidden
60    }
61
62    fn importance(&self) -> DiagImportance {
63        DiagImportance::Primary
64    }
65
66    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx>;
67}
68
69/// A function call where the callee is a pointer.
70#[derive(Debug)]
71pub(crate) struct FnCallIndirect;
72impl<'tcx> NonConstOp<'tcx> for FnCallIndirect {
73    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
74        ccx.dcx().create_err(errors::UnallowedFnPointerCall { span, kind: ccx.const_kind() })
75    }
76}
77
78/// A call to a function that is in a trait, or has trait bounds that make it conditionally-const.
79#[derive(Debug)]
80pub(crate) struct ConditionallyConstCall<'tcx> {
81    pub callee: DefId,
82    pub args: GenericArgsRef<'tcx>,
83    pub span: Span,
84    pub call_source: CallSource,
85}
86
87impl<'tcx> NonConstOp<'tcx> for ConditionallyConstCall<'tcx> {
88    fn status_in_item(&self, _ccx: &ConstCx<'_, 'tcx>) -> Status {
89        // We use the `const_trait_impl` gate for all conditionally-const calls.
90        Status::Unstable {
91            gate: sym::const_trait_impl,
92            gate_already_checked: false,
93            safe_to_expose_on_stable: false,
94            // We don't want the "mark the callee as `#[rustc_const_stable_indirect]`" hint
95            is_function_call: false,
96        }
97    }
98
99    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, _: Span) -> Diag<'tcx> {
100        let mut diag = build_error_for_const_call(
101            ccx,
102            self.callee,
103            self.args,
104            self.span,
105            self.call_source,
106            "conditionally",
107            |_, _, _| {},
108        );
109
110        // Override code and mention feature.
111        diag.code(E0658);
112        add_feature_diagnostics(&mut diag, ccx.tcx.sess, sym::const_trait_impl);
113
114        diag
115    }
116}
117
118/// A function call where the callee is not marked as `const`.
119#[derive(Debug, Clone, Copy)]
120pub(crate) struct FnCallNonConst<'tcx> {
121    pub callee: DefId,
122    pub args: GenericArgsRef<'tcx>,
123    pub span: Span,
124    pub call_source: CallSource,
125}
126
127impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
128    // FIXME: make this translatable
129    #[allow(rustc::diagnostic_outside_of_impl)]
130    #[allow(rustc::untranslatable_diagnostic)]
131    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, _: Span) -> Diag<'tcx> {
132        let tcx = ccx.tcx;
133        let caller = ccx.def_id();
134
135        let mut err = build_error_for_const_call(
136            ccx,
137            self.callee,
138            self.args,
139            self.span,
140            self.call_source,
141            "non",
142            |err, self_ty, trait_id| {
143                // FIXME(const_trait_impl): Do we need any of this on the non-const codepath?
144
145                let trait_ref = TraitRef::from_method(tcx, trait_id, self.args);
146
147                match self_ty.kind() {
148                    Param(param_ty) => {
149                        debug!(?param_ty);
150                        if let Some(generics) = tcx.hir_node_by_def_id(caller).generics() {
151                            let constraint = with_no_trimmed_paths!(format!(
152                                "~const {}",
153                                trait_ref.print_trait_sugared(),
154                            ));
155                            suggest_constraining_type_param(
156                                tcx,
157                                generics,
158                                err,
159                                param_ty.name.as_str(),
160                                &constraint,
161                                Some(trait_ref.def_id),
162                                None,
163                            );
164                        }
165                    }
166                    ty::Adt(..) => {
167                        let (infcx, param_env) =
168                            tcx.infer_ctxt().build_with_typing_env(ccx.typing_env);
169                        let obligation =
170                            Obligation::new(tcx, ObligationCause::dummy(), param_env, trait_ref);
171                        let mut selcx = SelectionContext::new(&infcx);
172                        let implsrc = selcx.select(&obligation);
173                        if let Ok(Some(ImplSource::UserDefined(data))) = implsrc {
174                            // FIXME(const_trait_impl) revisit this
175                            if !tcx.is_const_trait_impl(data.impl_def_id) {
176                                let span = tcx.def_span(data.impl_def_id);
177                                err.subdiagnostic(errors::NonConstImplNote { span });
178                            }
179                        }
180                    }
181                    _ => {}
182                }
183            },
184        );
185
186        if let ConstContext::Static(_) = ccx.const_kind() {
187            err.note(fluent_generated::const_eval_lazy_lock);
188        }
189
190        err
191    }
192}
193
194/// Build an error message reporting that a function call is not const (or only
195/// conditionally const). In case that this call is desugared (like an operator
196/// or sugar from something like a `for` loop), try to build a better error message
197/// that doesn't call it a method.
198fn build_error_for_const_call<'tcx>(
199    ccx: &ConstCx<'_, 'tcx>,
200    callee: DefId,
201    args: ty::GenericArgsRef<'tcx>,
202    span: Span,
203    call_source: CallSource,
204    non_or_conditionally: &'static str,
205    note_trait_if_possible: impl FnOnce(&mut Diag<'tcx>, Ty<'tcx>, DefId),
206) -> Diag<'tcx> {
207    let tcx = ccx.tcx;
208
209    let call_kind =
210        call_kind(tcx, ccx.typing_env, callee, args, span, call_source.from_hir_call(), None);
211
212    debug!(?call_kind);
213
214    let mut err = match call_kind {
215        CallKind::Normal { desugaring: Some((kind, self_ty)), .. } => {
216            macro_rules! error {
217                ($err:ident) => {
218                    tcx.dcx().create_err(errors::$err {
219                        span,
220                        ty: self_ty,
221                        kind: ccx.const_kind(),
222                        non_or_conditionally,
223                    })
224                };
225            }
226
227            // Don't point at the trait if this is a desugaring...
228            // FIXME(const_trait_impl): we could perhaps do this for `Iterator`.
229            match kind {
230                CallDesugaringKind::ForLoopIntoIter | CallDesugaringKind::ForLoopNext => {
231                    error!(NonConstForLoopIntoIter)
232                }
233                CallDesugaringKind::QuestionBranch => {
234                    error!(NonConstQuestionBranch)
235                }
236                CallDesugaringKind::QuestionFromResidual => {
237                    error!(NonConstQuestionFromResidual)
238                }
239                CallDesugaringKind::TryBlockFromOutput => {
240                    error!(NonConstTryBlockFromOutput)
241                }
242                CallDesugaringKind::Await => {
243                    error!(NonConstAwait)
244                }
245            }
246        }
247        CallKind::FnCall { fn_trait_id, self_ty } => {
248            let note = match self_ty.kind() {
249                FnDef(def_id, ..) => {
250                    let span = tcx.def_span(*def_id);
251                    if ccx.tcx.is_const_fn(*def_id) {
252                        span_bug!(span, "calling const FnDef errored when it shouldn't");
253                    }
254
255                    Some(errors::NonConstClosureNote::FnDef { span })
256                }
257                FnPtr(..) => Some(errors::NonConstClosureNote::FnPtr),
258                Closure(..) => Some(errors::NonConstClosureNote::Closure),
259                _ => None,
260            };
261
262            let mut err = tcx.dcx().create_err(errors::NonConstClosure {
263                span,
264                kind: ccx.const_kind(),
265                note,
266                non_or_conditionally,
267            });
268
269            note_trait_if_possible(&mut err, self_ty, fn_trait_id);
270            err
271        }
272        CallKind::Operator { trait_id, self_ty, .. } => {
273            let mut err = if let CallSource::MatchCmp = call_source {
274                tcx.dcx().create_err(errors::NonConstMatchEq {
275                    span,
276                    kind: ccx.const_kind(),
277                    ty: self_ty,
278                    non_or_conditionally,
279                })
280            } else {
281                let mut sugg = None;
282
283                if ccx.tcx.is_lang_item(trait_id, LangItem::PartialEq) {
284                    match (args[0].unpack(), args[1].unpack()) {
285                        (GenericArgKind::Type(self_ty), GenericArgKind::Type(rhs_ty))
286                            if self_ty == rhs_ty
287                                && self_ty.is_ref()
288                                && self_ty.peel_refs().is_primitive() =>
289                        {
290                            let mut num_refs = 0;
291                            let mut tmp_ty = self_ty;
292                            while let rustc_middle::ty::Ref(_, inner_ty, _) = tmp_ty.kind() {
293                                num_refs += 1;
294                                tmp_ty = *inner_ty;
295                            }
296                            let deref = "*".repeat(num_refs);
297
298                            if let Ok(call_str) = ccx.tcx.sess.source_map().span_to_snippet(span) {
299                                if let Some(eq_idx) = call_str.find("==") {
300                                    if let Some(rhs_idx) =
301                                        call_str[(eq_idx + 2)..].find(|c: char| !c.is_whitespace())
302                                    {
303                                        let rhs_pos =
304                                            span.lo() + BytePos::from_usize(eq_idx + 2 + rhs_idx);
305                                        let rhs_span = span.with_lo(rhs_pos).with_hi(rhs_pos);
306                                        sugg = Some(errors::ConsiderDereferencing {
307                                            deref,
308                                            span: span.shrink_to_lo(),
309                                            rhs_span,
310                                        });
311                                    }
312                                }
313                            }
314                        }
315                        _ => {}
316                    }
317                }
318                tcx.dcx().create_err(errors::NonConstOperator {
319                    span,
320                    kind: ccx.const_kind(),
321                    sugg,
322                    non_or_conditionally,
323                })
324            };
325
326            note_trait_if_possible(&mut err, self_ty, trait_id);
327            err
328        }
329        CallKind::DerefCoercion { deref_target_span, deref_target_ty, self_ty } => {
330            // Check first whether the source is accessible (issue #87060)
331            let target = if let Some(deref_target_span) = deref_target_span
332                && tcx.sess.source_map().is_span_accessible(deref_target_span)
333            {
334                Some(deref_target_span)
335            } else {
336                None
337            };
338
339            let mut err = tcx.dcx().create_err(errors::NonConstDerefCoercion {
340                span,
341                ty: self_ty,
342                kind: ccx.const_kind(),
343                target_ty: deref_target_ty,
344                deref_target: target,
345                non_or_conditionally,
346            });
347
348            note_trait_if_possible(
349                &mut err,
350                self_ty,
351                tcx.require_lang_item(LangItem::Deref, Some(span)),
352            );
353            err
354        }
355        _ if tcx.opt_parent(callee) == tcx.get_diagnostic_item(sym::ArgumentMethods) => {
356            ccx.dcx().create_err(errors::NonConstFmtMacroCall {
357                span,
358                kind: ccx.const_kind(),
359                non_or_conditionally,
360            })
361        }
362        _ => ccx.dcx().create_err(errors::NonConstFnCall {
363            span,
364            def_descr: ccx.tcx.def_descr(callee),
365            def_path_str: ccx.tcx.def_path_str_with_args(callee, args),
366            kind: ccx.const_kind(),
367            non_or_conditionally,
368        }),
369    };
370
371    err.note(format!(
372        "calls in {}s are limited to constant functions, \
373             tuple structs and tuple variants",
374        ccx.const_kind(),
375    ));
376
377    err
378}
379
380/// A call to an `#[unstable]` const fn, `#[rustc_const_unstable]` function or trait.
381///
382/// Contains the name of the feature that would allow the use of this function/trait.
383#[derive(Debug)]
384pub(crate) struct CallUnstable {
385    pub def_id: DefId,
386    pub feature: Symbol,
387    /// If this is true, then the feature is enabled, but we need to still check if it is safe to
388    /// expose on stable.
389    pub feature_enabled: bool,
390    pub safe_to_expose_on_stable: bool,
391    pub suggestion_span: Option<Span>,
392    /// true if `def_id` is the function we are calling, false if `def_id` is an unstable trait.
393    pub is_function_call: bool,
394}
395
396impl<'tcx> NonConstOp<'tcx> for CallUnstable {
397    fn status_in_item(&self, _ccx: &ConstCx<'_, 'tcx>) -> Status {
398        Status::Unstable {
399            gate: self.feature,
400            gate_already_checked: self.feature_enabled,
401            safe_to_expose_on_stable: self.safe_to_expose_on_stable,
402            is_function_call: self.is_function_call,
403        }
404    }
405
406    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
407        assert!(!self.feature_enabled);
408        let mut err = if self.is_function_call {
409            ccx.dcx().create_err(errors::UnstableConstFn {
410                span,
411                def_path: ccx.tcx.def_path_str(self.def_id),
412            })
413        } else {
414            ccx.dcx().create_err(errors::UnstableConstTrait {
415                span,
416                def_path: ccx.tcx.def_path_str(self.def_id),
417            })
418        };
419        // FIXME: make this translatable
420        let msg = format!("add `#![feature({})]` to the crate attributes to enable", self.feature);
421        #[allow(rustc::untranslatable_diagnostic)]
422        if let Some(span) = self.suggestion_span {
423            err.span_suggestion_verbose(
424                span,
425                msg,
426                format!("#![feature({})]\n", self.feature),
427                Applicability::MachineApplicable,
428            );
429        } else {
430            err.help(msg);
431        }
432
433        err
434    }
435}
436
437/// A call to an intrinsic that is just not const-callable at all.
438#[derive(Debug)]
439pub(crate) struct IntrinsicNonConst {
440    pub name: Symbol,
441}
442
443impl<'tcx> NonConstOp<'tcx> for IntrinsicNonConst {
444    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
445        ccx.dcx().create_err(errors::NonConstIntrinsic {
446            span,
447            name: self.name,
448            kind: ccx.const_kind(),
449        })
450    }
451}
452
453/// A call to an intrinsic that is just not const-callable at all.
454#[derive(Debug)]
455pub(crate) struct IntrinsicUnstable {
456    pub name: Symbol,
457    pub feature: Symbol,
458    pub const_stable_indirect: bool,
459    pub suggestion: Option<Span>,
460}
461
462impl<'tcx> NonConstOp<'tcx> for IntrinsicUnstable {
463    fn status_in_item(&self, _ccx: &ConstCx<'_, 'tcx>) -> Status {
464        Status::Unstable {
465            gate: self.feature,
466            gate_already_checked: false,
467            safe_to_expose_on_stable: self.const_stable_indirect,
468            // We do *not* want to suggest to mark the intrinsic as `const_stable_indirect`,
469            // that's not a trivial change!
470            is_function_call: false,
471        }
472    }
473
474    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
475        ccx.dcx().create_err(errors::UnstableIntrinsic {
476            span,
477            name: self.name,
478            feature: self.feature,
479            suggestion: self.suggestion,
480            help: self.suggestion.is_none(),
481        })
482    }
483}
484
485#[derive(Debug)]
486pub(crate) struct Coroutine(pub hir::CoroutineKind);
487impl<'tcx> NonConstOp<'tcx> for Coroutine {
488    fn status_in_item(&self, _: &ConstCx<'_, 'tcx>) -> Status {
489        if let hir::CoroutineKind::Desugared(
490            hir::CoroutineDesugaring::Async,
491            hir::CoroutineSource::Block,
492        ) = self.0
493        {
494            Status::Unstable {
495                gate: sym::const_async_blocks,
496                gate_already_checked: false,
497                safe_to_expose_on_stable: false,
498                is_function_call: false,
499            }
500        } else {
501            Status::Forbidden
502        }
503    }
504
505    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
506        let msg = format!("{:#}s are not allowed in {}s", self.0, ccx.const_kind());
507        if let Status::Unstable { gate, .. } = self.status_in_item(ccx) {
508            ccx.tcx.sess.create_feature_err(errors::UnallowedOpInConstContext { span, msg }, gate)
509        } else {
510            ccx.dcx().create_err(errors::UnallowedOpInConstContext { span, msg })
511        }
512    }
513}
514
515#[derive(Debug)]
516pub(crate) struct HeapAllocation;
517impl<'tcx> NonConstOp<'tcx> for HeapAllocation {
518    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
519        ccx.dcx().create_err(errors::UnallowedHeapAllocations {
520            span,
521            kind: ccx.const_kind(),
522            teach: ccx.tcx.sess.teach(E0010),
523        })
524    }
525}
526
527#[derive(Debug)]
528pub(crate) struct InlineAsm;
529impl<'tcx> NonConstOp<'tcx> for InlineAsm {
530    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
531        ccx.dcx().create_err(errors::UnallowedInlineAsm { span, kind: ccx.const_kind() })
532    }
533}
534
535#[derive(Debug)]
536pub(crate) struct LiveDrop<'tcx> {
537    pub dropped_at: Span,
538    pub dropped_ty: Ty<'tcx>,
539    pub needs_non_const_drop: bool,
540}
541impl<'tcx> NonConstOp<'tcx> for LiveDrop<'tcx> {
542    fn status_in_item(&self, _ccx: &ConstCx<'_, 'tcx>) -> Status {
543        if self.needs_non_const_drop {
544            Status::Forbidden
545        } else {
546            Status::Unstable {
547                gate: sym::const_destruct,
548                gate_already_checked: false,
549                safe_to_expose_on_stable: false,
550                is_function_call: false,
551            }
552        }
553    }
554
555    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
556        if self.needs_non_const_drop {
557            ccx.dcx().create_err(errors::LiveDrop {
558                span,
559                dropped_ty: self.dropped_ty,
560                kind: ccx.const_kind(),
561                dropped_at: self.dropped_at,
562            })
563        } else {
564            ccx.tcx.sess.create_feature_err(
565                errors::LiveDrop {
566                    span,
567                    dropped_ty: self.dropped_ty,
568                    kind: ccx.const_kind(),
569                    dropped_at: self.dropped_at,
570                },
571                sym::const_destruct,
572            )
573        }
574    }
575}
576
577#[derive(Debug)]
578/// A borrow of a type that contains an `UnsafeCell` somewhere. The borrow might escape to
579/// the final value of the constant, and thus we cannot allow this (for now). We may allow
580/// it in the future for static items.
581pub(crate) struct EscapingCellBorrow;
582impl<'tcx> NonConstOp<'tcx> for EscapingCellBorrow {
583    fn importance(&self) -> DiagImportance {
584        // Most likely the code will try to do mutation with these borrows, which
585        // triggers its own errors. Only show this one if that does not happen.
586        DiagImportance::Secondary
587    }
588    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
589        ccx.dcx().create_err(errors::InteriorMutableRefEscaping {
590            span,
591            opt_help: matches!(ccx.const_kind(), hir::ConstContext::Static(_)),
592            kind: ccx.const_kind(),
593            teach: ccx.tcx.sess.teach(E0492),
594        })
595    }
596}
597
598#[derive(Debug)]
599/// This op is for `&mut` borrows in the trailing expression of a constant
600/// which uses the "enclosing scopes rule" to leak its locals into anonymous
601/// static or const items.
602pub(crate) struct EscapingMutBorrow(pub hir::BorrowKind);
603
604impl<'tcx> NonConstOp<'tcx> for EscapingMutBorrow {
605    fn status_in_item(&self, _ccx: &ConstCx<'_, 'tcx>) -> Status {
606        Status::Forbidden
607    }
608
609    fn importance(&self) -> DiagImportance {
610        // Most likely the code will try to do mutation with these borrows, which
611        // triggers its own errors. Only show this one if that does not happen.
612        DiagImportance::Secondary
613    }
614
615    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
616        match self.0 {
617            hir::BorrowKind::Raw => ccx.tcx.dcx().create_err(errors::MutableRawEscaping {
618                span,
619                kind: ccx.const_kind(),
620                teach: ccx.tcx.sess.teach(E0764),
621            }),
622            hir::BorrowKind::Ref => ccx.dcx().create_err(errors::MutableRefEscaping {
623                span,
624                kind: ccx.const_kind(),
625                teach: ccx.tcx.sess.teach(E0764),
626            }),
627        }
628    }
629}
630
631/// A call to a `panic()` lang item where the first argument is _not_ a `&str`.
632#[derive(Debug)]
633pub(crate) struct PanicNonStr;
634impl<'tcx> NonConstOp<'tcx> for PanicNonStr {
635    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
636        ccx.dcx().create_err(errors::PanicNonStrErr { span })
637    }
638}
639
640/// Comparing raw pointers for equality.
641/// Not currently intended to ever be allowed, even behind a feature gate: operation depends on
642/// allocation base addresses that are not known at compile-time.
643#[derive(Debug)]
644pub(crate) struct RawPtrComparison;
645impl<'tcx> NonConstOp<'tcx> for RawPtrComparison {
646    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
647        // FIXME(const_trait_impl): revert to span_bug?
648        ccx.dcx().create_err(errors::RawPtrComparisonErr { span })
649    }
650}
651
652/// Casting raw pointer or function pointer to an integer.
653/// Not currently intended to ever be allowed, even behind a feature gate: operation depends on
654/// allocation base addresses that are not known at compile-time.
655#[derive(Debug)]
656pub(crate) struct RawPtrToIntCast;
657impl<'tcx> NonConstOp<'tcx> for RawPtrToIntCast {
658    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
659        ccx.dcx().create_err(errors::RawPtrToIntErr { span })
660    }
661}
662
663/// An access to a thread-local `static`.
664#[derive(Debug)]
665pub(crate) struct ThreadLocalAccess;
666impl<'tcx> NonConstOp<'tcx> for ThreadLocalAccess {
667    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
668        ccx.dcx().create_err(errors::ThreadLocalAccessErr { span })
669    }
670}
rustc_const_eval/check_consts/ops.rs

rustc_const_eval/check_consts/
ops.rs
