Diagnose delayed typos when parsing a postfix expression with an

unmatched l_paren before setting the LHS to ExprError().

Fixes PR23285.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@236371 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Parse/ParseExpr.cpp

@@ -1479,7 +1479,19 @@ Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
       if (LHS.isInvalid()) {
         SkipUntil(tok::r_paren, StopAtSemi);
       } else if (Tok.isNot(tok::r_paren)) {
-        PT.consumeClose();
+        bool HadDelayedTypo = false;
+        if (Actions.CorrectDelayedTyposInExpr(LHS).get() != LHS.get())
+          HadDelayedTypo = true;
+        for (auto &E : ArgExprs)
+          if (Actions.CorrectDelayedTyposInExpr(E).get() != E)
+            HadDelayedTypo = true;
+        // If there were delayed typos in the LHS or ArgExprs, call SkipUntil
+        // instead of PT.consumeClose() to avoid emitting extra diagnostics for
+        // the unmatched l_paren.
+        if (HadDelayedTypo)
+          SkipUntil(tok::r_paren, StopAtSemi);
+        else
+          PT.consumeClose();
         LHS = ExprError();
       } else {
         assert((ArgExprs.size() == 0 || 

test/SemaCXX/typo-correction-delayed.cpp

@@ -203,3 +203,9 @@ namespace PR23350 {
 int z = 1 ? N : ;  // expected-error {{expected expression}}
 // expected-error-re@-1 {{use of undeclared identifier 'N'{{$}}}}
 }
+
+// PR 23285. This test must be at the end of the file to avoid additional,
+// unwanted diagnostics.
+// expected-error-re@+2 {{use of undeclared identifier 'uintmax_t'{{$}}}}
+// expected-error@+1 {{expected ';' after top level declarator}}
+unsigned int a = 0(uintmax_t