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Tweak a confusing comment in create_match_candidates #126926

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Jun 25, 2024
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Tweak a confusing comment in create_match_candidates #126926

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7 changes: 5 additions & 2 deletions compiler/rustc_mir_build/src/build/matches/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -358,8 +358,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
where
'a: 'pat,
{
// Assemble a list of candidates: there is one candidate per pattern,
// which means there may be more than one candidate *per arm*.
// Assemble the initial list of candidates. These top-level candidates
// are 1:1 with the original match arms, but other parts of match
// lowering also introduce subcandidates (for subpatterns), and will
// also flatten candidates in some cases. So in general a list of
// candidates does _not_ necessarily correspond to a list of arms.
arms.iter()
.copied()
.map(|arm| {
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