fix corner case in reduce_vars (#3623)

fixes #3622
2019-12-04 20:24:55 +08:00
parent 500e31e03b
commit d68ddc31f9
2 changed files with 31 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -701,8 +701,11 @@ merge(Compressor.prototype, {
                node.argnames.forEach(function(arg, i) {
                    var d = arg.definition();
                    if (d.fixed === undefined && (!node.uses_arguments || tw.has_directive("use strict"))) {
+                        var value = iife.args[i];
                        d.fixed = function() {
-                            return iife.args[i] || make_node(AST_Undefined, iife);
+                            var j = node.argnames.indexOf(arg);
+                            if (j < 0) return value;
+                            return iife.args[j] || make_node(AST_Undefined, iife);
                        };
                        tw.loop_ids[d.id] = tw.in_loop;
                        mark(tw, d, true);