fix unused on for-in statements (#1843)

Only need to avoid `var` within the initialisation block. fixes #1841
2017-04-24 03:14:01 +08:00
parent d0faa471db
commit 2c21dc5e8e
2 changed files with 55 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1992,7 +1992,7 @@ merge(Compressor.prototype, {
                        }
                        return node;
                    }
-                    if (drop_vars && node instanceof AST_Definitions && !(tt.parent() instanceof AST_ForIn)) {
+                    if (drop_vars && node instanceof AST_Definitions && !(tt.parent() instanceof AST_ForIn && tt.parent().init === node)) {
                        var def = node.definitions.filter(function(def){
                            if (def.value) def.value = def.value.transform(tt);
                            var sym = def.name.definition();