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 9bf72cf758
commit 9e62628171
2 changed files with 53 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1970,7 +1970,7 @@ 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)) {
                        // place uninitialized names at the start
                        var body = [], head = [], tail = [];
                        // for unused names whose initialization has