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Structurally resolve pointee in check_pat_lit #112428

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Merged
merged 1 commit into from
Jun 9, 2023
Merged

Structurally resolve pointee in check_pat_lit #112428

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5 changes: 2 additions & 3 deletions compiler/rustc_hir_typeck/src/pat.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -393,9 +393,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
// They can denote both statically and dynamically-sized byte arrays.
let mut pat_ty = ty;
if let hir::ExprKind::Lit(Spanned { node: ast::LitKind::ByteStr(..), .. }) = lt.kind {
let expected = self.structurally_resolved_type(span, expected);
if let ty::Ref(_, inner_ty, _) = expected.kind()
&& matches!(inner_ty.kind(), ty::Slice(_))
if let ty::Ref(_, inner_ty, _) = *self.structurally_resolved_type(span, expected).kind()
&& self.structurally_resolved_type(span, inner_ty).is_slice()
{
let tcx = self.tcx;
trace!(?lt.hir_id.local_id, "polymorphic byte string lit");
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11 changes: 11 additions & 0 deletions tests/ui/traits/new-solver/slice-match-byte-lit.rs
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@@ -0,0 +1,11 @@
// compile-flags: -Ztrait-solver=next
// check-pass

fn test(s: &[u8]) {
match &s[0..3] {
b"uwu" => {}
_ => {}
}
}

fn main() {}