Use if let instead of match

src/librustc_resolve/lib.rs

@@ -951,7 +951,7 @@ enum RibKind<'a> {
  TraitOrImplItemRibKind,
 
  /// We passed through a function definition. Disallow upvars.
- /// Permit only those const parameters specified in the function's generics.
+ /// Permit only those const parameters that are specified in the function's generics.
  FnItemRibKind,
 
  /// We passed through an item scope. Disallow upvars.
@@ -3924,19 +3924,16 @@ impl<'a> Resolver<'a> {
  ribs.next();
  }
  for rib in ribs {
- match rib.kind {
- ItemRibKind | FnItemRibKind => {
- // This was an attempt to use a const parameter outside its scope.
- if record_used {
- resolve_error(
- self,
- span,
- ResolutionError::GenericParamsFromOuterFunction(def),
- );
- }
- return Def::Err;
+ if let ItemRibKind | FnItemRibKind = rib.kind {
+ // This was an attempt to use a const parameter outside its scope.
+ if record_used {
+ resolve_error(
+ self,
+ span,
+ ResolutionError::GenericParamsFromOuterFunction(def),
+ );
  }
- _ => {}
+ return Def::Err;
  }
  }
  }