fix `join_vars` on property accessors (#2895)

fixes #2893

1 files changed, 6 insertions, 5 deletions

diff --git a/lib/compress.js b/lib/compress.js
index dc453f14..e70af436 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1816,11 +1816,12 @@ merge(Compressor.prototype, {
                 }
                 if (prop instanceof AST_Node) break;
                 prop = "" + prop;
-                if (compressor.has_directive("use strict")) {
-                    if (!all(def.value.properties, function(node) {
-                        return node.key != prop && node.key.name != prop;
-                    })) break;
-                }
+                var diff = compressor.has_directive("use strict") ? function(node) {
+                    return node.key != prop && node.key.name != prop;
+                } : function(node) {
+                    return node.key.name != prop;
+                };
+                if (!all(def.value.properties, diff)) break;
                 def.value.properties.push(make_node(AST_ObjectKeyVal, node, {
                     key: prop,
                     value: node.right