fix PR5740: a colon is sacred when parsing case statement expressions!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91016 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/Parse/ParseStmt.cpp b/lib/Parse/ParseStmt.cpp
index f0de3f5345..5267ef0ecc 100644
--- a/lib/Parse/ParseStmt.cpp
+++ b/lib/Parse/ParseStmt.cpp
@@ -279,6 +279,11 @@ Parser::OwningStmtResult Parser::ParseCaseStatement(AttributeList *Attr) {
       ConsumeToken();
     }
     
+    /// We don't want to treat 'case x : y' as a potential typo for 'case x::y'.
+    /// Disable this form of error recovery while we're parsing the case
+    /// expression.
+    ColonProtectionRAIIObject ColonProtection(*this);
+    
     OwningExprResult LHS(ParseConstantExpression());
     if (LHS.isInvalid()) {
       SkipUntil(tok::colon);
@@ -298,6 +303,8 @@ Parser::OwningStmtResult Parser::ParseCaseStatement(AttributeList *Attr) {
         return StmtError();
       }
     }
+    
+    ColonProtection.restore();
 
     if (Tok.isNot(tok::colon)) {
       Diag(Tok, diag::err_expected_colon_after) << "'case'";