From 0a1c9b34cea8bf740c70d5457ef9e3bd37778607 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 21 Mar 2020 00:55:24 +0800
Subject: fix corner case in `evaluate` & `ie8` (#3751)

fixes #3750
---
 lib/compress.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'lib/compress.js')

diff --git a/lib/compress.js b/lib/compress.js
index 96229369..343994e7 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3373,15 +3373,18 @@ merge(Compressor.prototype, {
                 var args = eval_args(this.args);
                 if (!args) return this;
                 if (!stat.value) return undefined;
-                fn.argnames.forEach(function(sym, i) {
+                if (!all(fn.argnames, function(sym, i) {
                     var value = args[i];
-                    sym.definition().references.forEach(function(node) {
+                    var def = sym.definition();
+                    if (def.orig[def.orig.length - 1] !== sym) return false;
+                    def.references.forEach(function(node) {
                         node._eval = function() {
                             return value;
                         };
                         cached.push(node);
                     });
-                });
+                    return true;
+                })) return this;
                 fn.evaluating = true;
                 var val = stat.value._eval(compressor, ignore_side_effects, cached, depth);
                 delete fn.evaluating;
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