Referencing a global is assumed to have side effects.

Close #550
2014-09-28 11:16:51 +03:00
parent f0c1a01bc2
commit 01d19b4b52
3 changed files with 30 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -897,7 +897,9 @@ merge(Compressor.prototype, {
                || this.operator == "--"
                || this.expression.has_side_effects(compressor);
        });
-        def(AST_SymbolRef, function(compressor){ return false });
+        def(AST_SymbolRef, function(compressor){
+            return this.global() && this.undeclared();
+        });
        def(AST_Object, function(compressor){
            for (var i = this.properties.length; --i >= 0;)
                if (this.properties[i].has_side_effects(compressor))