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Add comment on cap_to_weakly_not

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Co-authored-by: Guillaume Boisseau <Nadrieril@users.noreply.github.com>
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Jules Bertholet 2024-05-10 13:53:48 -04:00 • committed by GitHub
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commit 6d5c6f541f
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compiler/rustc_hir_typeck/src/pat.rs
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@ -2141,6 +2141,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let mut inherited_ref_mutbl_match = false; let mut inherited_ref_mutbl_match = false;
if match_ergonomics_mode != MatchErgonomicsMode::Legacy { if match_ergonomics_mode != MatchErgonomicsMode::Legacy {
if pat_mutbl == Mutability::Not { if pat_mutbl == Mutability::Not {
// Prevent the inner pattern from binding with `ref mut`.
pat_info.max_ref_mutbl = pat_info.max_ref_mutbl.cap_to_weakly_not( pat_info.max_ref_mutbl = pat_info.max_ref_mutbl.cap_to_weakly_not(
inner.span.find_ancestor_inside(pat.span).map(|end| pat.span.until(end)), inner.span.find_ancestor_inside(pat.span).map(|end| pat.span.until(end)),
); );