minor

test/compress/dead-code.js

@@ -33,11 +33,17 @@ dead_code_2_should_warn: {
             x = 10;
             throw "foo";
             // completely discarding the `if` would introduce some
-            // bugs.  UglifyJS v1 doesn't deal with this issue.
+            // bugs.  UglifyJS v1 doesn't deal with this issue; in v2
+            // we copy any declarations to the upper scope.
             if (x) {
                 y();
                 var x;
                 function g(){};
+                // but nested declarations should not be kept.
+                (function(){
+                    var q;
+                    function y(){};
+                })();
             }
         }
     }