From: kzc <kzc@users.noreply.github.com>
Date: Fri, 3 Mar 2017 18:39:54 +0000 (-0500)
Subject: disallow collapse_vars constant replacement in for-in statements (#1543)
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=ce54c9cceef68b78be7cc429988df26add904d9b;p=UglifyJS.git

disallow collapse_vars constant replacement in for-in statements (#1543)
---

diff --git a/lib/compress.js b/lib/compress.js
index 2cd79128..35459006 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -525,11 +525,9 @@ merge(Compressor.prototype, {
                     // Constant single use vars can be replaced in any scope.
                     if (var_decl.value.is_constant()) {
                         var ctt = new TreeTransformer(function(node) {
-                            if (node === ref) {
-                                var parent = ctt.parent();
-                                if (!(parent instanceof AST_ForIn && parent.init === node)) {
-                                    return replace_var(node, parent, true);
-                                }
+                            if (node === ref
+                                && !ctt.find_parent(AST_ForIn)) {
+                                return replace_var(node, ctt.parent(), true);
                             }
                         });
                         stat.transform(ctt);