bjoernager/rust
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Use more slice patterns inside the compiler

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This commit is contained in:
León Orell Valerian Liehr 2024-08-07 12:41:49 +02:00
parent 60d146580c
commit c4c518d2d4
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40 changed files with 191 additions and 221 deletions
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6
compiler/rustc_mir_build/src/thir/pattern/check_match.rs
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@ -483,9 +483,11 @@ impl<'p, 'tcx> MatchVisitor<'p, 'tcx> {
// Check if the match is exhaustive.
let witnesses = report.non_exhaustiveness_witnesses;
if !witnesses.is_empty() {
if source == hir::MatchSource::ForLoopDesugar && arms.len() == 2 {
if source == hir::MatchSource::ForLoopDesugar
&& let [_, snd_arm] = *arms
{
// the for loop pattern is not irrefutable
let pat = &self.thir[arms[1]].pattern;
let pat = &self.thir[snd_arm].pattern;
// `pat` should be `Some(<pat_field>)` from a desugared for loop.
debug_assert_eq!(pat.span.desugaring_kind(), Some(DesugaringKind::ForLoop));
let PatKind::Variant { ref subpatterns, .. } = pat.kind else { bug!() };