From ac403018135b0ba700ef6223970c1bbc2a518107 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Fri, 17 Mar 2017 00:26:48 +0800
Subject: fix chained evaluation (#1610)

`reduce_vars` enables substitution of variables but did not clone the value's `AST_Node`.

This confuses `collapse_vars` and result in invalid AST and subsequent crash.

fixes #1609
---
 lib/compress.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/compress.js')

diff --git a/lib/compress.js b/lib/compress.js
index dac1f364..c3f12549 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3461,7 +3461,7 @@ merge(Compressor.prototype, {
                     }
                 }
                 if (d.should_replace) {
-                    return d.should_replace;
+                    return d.should_replace.clone(true);
                 }
             }
         }
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