fix corner case in join_vars (#3917)

fixes #3916
2020-05-21 22:26:46 +01:00
parent aeb9ea5ac2
commit fa14a9cfcd
2 changed files with 33 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2508,7 +2508,7 @@ merge(Compressor.prototype, {
                }
                if (prop instanceof AST_Node) break;
                prop = "" + prop;
-                var diff = compressor.has_directive("use strict") ? function(node) {
+                var diff = prop == "__proto__" || compressor.has_directive("use strict") ? function(node) {
                    return node.key != prop && node.key.name != prop;
                } : function(node) {
                    return node.key.name != prop;