Parse: Don't parse beyond the end of the synthetic default argument tok

Recovery from malformed lambda introducers would find us consuming the
synthetic default argument token, which is bad.  Instead, stop right
before that token.

llvm-svn: 225613

1 files changed, 10 insertions, 3 deletions

diff --git a/clang/lib/Parse/ParseExprCXX.cpp b/clang/lib/Parse/ParseExprCXX.cpp
index 355503caa9b..68bd45e38d1 100644
--- a/clang/lib/Parse/ParseExprCXX.cpp
+++ b/clang/lib/Parse/ParseExprCXX.cpp
@@ -716,9 +716,16 @@ ExprResult Parser::ParseLambdaExpression() {
   Optional<unsigned> DiagID = ParseLambdaIntroducer(Intro);
   if (DiagID) {
     Diag(Tok, DiagID.getValue());
-    SkipUntil(tok::r_square, StopAtSemi);
-    SkipUntil(tok::l_brace, StopAtSemi);
-    SkipUntil(tok::r_brace, StopAtSemi);
+    auto SkipUntilLambdaToken = [&](tok::TokenKind LambdaToken) {
+      // Don't skip past the end of the default argument.
+      SkipUntil(LambdaToken, tok::cxx_defaultarg_end,
+                StopAtSemi | StopBeforeMatch);
+      if (Tok.is(LambdaToken))
+        ConsumeAnyToken();
+    };
+    SkipUntilLambdaToken(tok::r_square);
+    SkipUntilLambdaToken(tok::l_brace);
+    SkipUntilLambdaToken(tok::r_brace);
     return ExprError();
   }