diff -r 3d94c73a824c -r 3c57bbf22aa2 src/compiler/SemanticAnalysis.cpp
--- a/src/compiler/SemanticAnalysis.cpp	Wed Dec 26 17:19:49 2012 -0800
+++ b/src/compiler/SemanticAnalysis.cpp	Wed Dec 26 17:20:55 2012 -0800
@@ -976,7 +976,7 @@
         cc_.reportError(pos, Message_TypeMismatch,
                         GetTypeName(argActual, aname, sizeof(aname)),
                         GetTypeName(argGiven, gname, sizeof(gname)));
-        return false;
+        return NULL;
     }
 
     return from;