fix collapse_vars on default function argument (#2299)

Avoid collision with local variable `undefined` under certain corner cases. fixes #2298
2017-09-04 02:32:33 +08:00
parent 3f355866cf
commit 395a17ccda
2 changed files with 43 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -847,7 +847,7 @@ merge(Compressor.prototype, {
                        if (sym.name in names) continue;
                        names[sym.name] = true;
                        var arg = iife.args[i];
-                        if (!arg) arg = make_node(AST_Undefined, sym);
+                        if (!arg) arg = make_node(AST_Undefined, sym).transform(compressor);
                        else {
                            var tw = new TreeWalker(function(node) {
                                if (!arg) return true;