Change RTN to use .. again

compiler/rustc_resolve/src/late.rs

@@ -1221,6 +1221,7 @@ impl<'a: 'ast, 'ast, 'tcx> Visitor<'ast> for LateResolutionVisitor<'a, '_, 'ast,
                         }
                     }
                 }
+                GenericArgs::ParenthesizedElided(_) => {}
             }
         }
     }

compiler/rustc_resolve/src/lib.rs

@@ -350,6 +350,7 @@ impl<'a> From<&'a ast::PathSegment> for Segment {
                     (args.span, found_lifetimes)
                 }
                 GenericArgs::Parenthesized(args) => (args.span, true),
+                GenericArgs::ParenthesizedElided(span) => (*span, true),
             }
         } else {
             (DUMMY_SP, false)