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Structurally resolve before builtin_index in EUV

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This commit is contained in:
Michael Goulet 2024-05-24 15:49:17 -04:00
parent 1af490de42
commit 61aac551b8
2 changed files with 18 additions and 1 deletions
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6
compiler/rustc_hir_typeck/src/expr_use_visitor.rs
View File

@ -1741,7 +1741,11 @@ impl<'tcx, Cx: TypeInformationCtxt<'tcx>, D: Delegate<'tcx>> ExprUseVisitor<'tcx
}
PatKind::Slice(before, ref slice, after) => {
let Some(element_ty) = place_with_id.place.ty().builtin_index() else {
let Some(element_ty) = self
.cx
.try_structurally_resolve_type(pat.span, place_with_id.place.ty())
.builtin_index()
else {
debug!("explicit index of non-indexable type {:?}", place_with_id);
return Err(self
.cx

13
tests/ui/traits/next-solver/typeck/index-of-projection.rs Normal file
View File

@ -0,0 +1,13 @@
//@ compile-flags: -Znext-solver
//@ check-pass
// Fixes a regression in `rustc_attr` where we weren't normalizing the
// output type of a index operator performing a `Ty::builtin_index` call,
// leading to an ICE.
fn main() {
let mut vec = [1, 2, 3];
let x = || {
let [..] = &vec[..];
};
}