[AST] Require a SourceRange for ErrorTypeRepr

Author: hamishknight

include/swift/AST/TypeRepr.h

@@ -229,11 +229,6 @@ class ErrorTypeRepr : public TypeRepr {
     return new (Context) ErrorTypeRepr(Range);
   }
 
-  static ErrorTypeRepr *
-  create(ASTContext &Context, SourceLoc Loc = SourceLoc()) {
-    return create(Context, SourceRange(Loc));
-  }
-
   static bool classof(const TypeRepr *T) {
     return T->getKind() == TypeReprKind::Error;
   }

lib/Parse/ParseDecl.cpp

@@ -9935,7 +9935,8 @@ Parser::parseDeclSubscript(SourceLoc StaticLoc,
 
     if (ElementTy.isNull()) {
       // Always set an element type.
-      ElementTy = makeParserResult(ElementTy, ErrorTypeRepr::create(Context));
+      ElementTy = makeParserResult(
+          ElementTy, ErrorTypeRepr::create(Context, getTypeErrorLoc()));
     }
   }