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Add comment and fix fmt issue

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Roxane 2021-08-27 09:00:50 -04:00
parent 8fcfd6e136
commit 110a9b3b1c
1 changed files with 12 additions and 1 deletions
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13
compiler/rustc_typeck/src/expr_use_visitor.rs
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@ -268,10 +268,21 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
if def.variants.len() > 1 { if def.variants.len() > 1 {
needs_to_be_read = true; needs_to_be_read = true;
} else if let Some(variant) = def.variants.iter().next() { } else if let Some(variant) = def.variants.iter().next() {
// We need to handle `const` in match arms slightly differently
// as they are not processed the same way as other match arms.
// Consider this const `const OP1: Opcode = Opcode(0x1)`, this
// will generate a pattern with kind Path while if use Opcode(0x1)
// this will generate pattern TupleStruct and Lit.
// When dealing with pat kind Path we need to make additional checks
// to ensure we have all the info needed to make a decision on whether
// to borrow discr.
//
// If the pat kind is a Path we want to check whether the // If the pat kind is a Path we want to check whether the
// variant contains at least one field. If that's the case, // variant contains at least one field. If that's the case,
// we want to borrow discr. // we want to borrow discr.
if matches!(pat.kind, PatKind::Path(..)) && variant.fields.len() > 0 { if matches!(pat.kind, PatKind::Path(..))
&& variant.fields.len() > 0
{
needs_to_be_read = true; needs_to_be_read = true;
} }
} }