--- a/xpcom/analysis/stack.js
+++ b/xpcom/analysis/stack.js
@@ -147,18 +147,21 @@ function process_cp_pre_genericize(fndec
         if (name == "operator new" || name == "operator new []") {
           let fncallobj = dehydra_convert(TREE_TYPE(fncall));
           if (fncallobj.parameters.length == 2 &&
               isVoidPtr(fncallobj.parameters[1]))
             return;
 
           let i;
           for (i in xrange(stack.length - 1, -1, -1)) {
-            if (TREE_CODE(stack[i]) != NOP_EXPR)
-              break;
+            if (TREE_CODE(stack[i]) == NOP_EXPR ||
+                TREE_CODE(stack[i]) == COMPOUND_EXPR)
+              continue;
+            
+            break;
           }
           let assign = stack[i];
           switch (TREE_CODE(assign)) {
           case VAR_DECL:
             break;
             
           case INIT_EXPR:
           case MODIFY_EXPR: