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Check for presence of field in typeck results before visiting it

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Co-authored-by: Michael Goulet <michael@errs.io>
This commit is contained in:
León Orell Valerian Liehr 2024-02-03 17:34:25 +01:00
parent cb4d9a1902
commit 4f773af1cc
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GPG Key ID: D17A07215F68E713
3 changed files with 27 additions and 1 deletions
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6
compiler/rustc_passes/src/dead.rs
View File

@ -464,7 +464,11 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> {
self.lookup_and_handle_method(expr.hir_id);
}
hir::ExprKind::Field(ref lhs, ..) => {
self.handle_field_access(lhs, expr.hir_id);
if self.typeck_results().opt_field_index(expr.hir_id).is_some() {
self.handle_field_access(lhs, expr.hir_id);
} else {
self.tcx.dcx().span_delayed_bug(expr.span, "couldn't resolve index for field");
}
}
hir::ExprKind::Struct(qpath, fields, _) => {
let res = self.typeck_results().qpath_res(qpath, expr.hir_id);

5
tests/ui/consts/const-eval/field-access-after-const-eval-fail-in-ty.rs Normal file
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@ -0,0 +1,5 @@
// Regression test for issue #120615.
fn main() {
[(); loop {}].field; //~ ERROR constant evaluation is taking a long time
}

17
tests/ui/consts/const-eval/field-access-after-const-eval-fail-in-ty.stderr Normal file
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@ -0,0 +1,17 @@
error: constant evaluation is taking a long time
--> $DIR/field-access-after-const-eval-fail-in-ty.rs:4:10
|
LL | [(); loop {}].field;
| ^^^^^^^
|
= note: this lint makes sure the compiler doesn't get stuck due to infinite loops in const eval.
If your compilation actually takes a long time, you can safely allow the lint.
help: the constant being evaluated
--> $DIR/field-access-after-const-eval-fail-in-ty.rs:4:10
|
LL | [(); loop {}].field;
| ^^^^^^^
= note: `#[deny(long_running_const_eval)]` on by default
error: aborting due to 1 previous error