HLSL: Address #839: avoid crash by distinguishing between bad argument and no argument.
diff --git a/hlsl/hlslGrammar.cpp b/hlsl/hlslGrammar.cpp
index f58f742..32b1de3 100755
--- a/hlsl/hlslGrammar.cpp
+++ b/hlsl/hlslGrammar.cpp
@@ -2926,11 +2926,16 @@
if (! acceptTokenClass(EHTokLeftParen))
return false;
+ // RIGHT_PAREN
+ if (acceptTokenClass(EHTokRightParen))
+ return true;
+
+ // must now be at least one expression...
do {
// expression
TIntermTyped* arg;
if (! acceptAssignmentExpression(arg))
- break;
+ return false;
// hook it up
parseContext.handleFunctionArgument(function, arguments, arg);