Address review comment

Author: hokein

clang/include/clang/Basic/DiagnosticParseKinds.td

@@ -703,8 +703,6 @@ def ext_consteval_if : ExtWarn<
 def warn_cxx20_compat_consteval_if : Warning<
   "consteval if is incompatible with C++ standards before C++23">,
   InGroup<CXXPre23Compat>, DefaultIgnore;
-def err_extraneous_trailing_comma : Error<
-  "extraneous trailing comma">;
 
 def ext_init_statement : ExtWarn<
   "'%select{if|switch}0' initialization statements are a C++17 extension">,

clang/lib/Parse/ParseExpr.cpp

@@ -2238,8 +2238,7 @@ Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
               RunSignatureHelp();
             LHS = ExprError();
           } else if (!HasError && HasTrailingComma) {
-            // FIXME: add a FIXIT to remove the trailing comma.
-            Diag(Tok, diag::err_extraneous_trailing_comma);
+            Diag(Tok, diag::err_expected_expression);
           } else if (LHS.isInvalid()) {
             for (auto &E : ArgExprs)
               Actions.CorrectDelayedTyposInExpr(E);

clang/test/Parser/recovery.cpp

@@ -219,6 +219,6 @@ class :: : {} a;  // expected-error {{expected identifier}} expected-error {{exp
 namespace GH125225 {
 void func(int);
 void k() {
-  func(1, ); // expected-error {{extraneous trailing comma}}
+  func(1, ); // expected-error {{expected expression}}
 }
 }