From 1e9b576ee9938d6acb9dff277474e9a32f866690 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Fri, 1 Nov 2019 00:01:25 +0800
Subject: fix corner case in `evaluate` (#3559)

fixes #3558
---
 lib/compress.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'lib')

diff --git a/lib/compress.js b/lib/compress.js
index a6f5d20b..65768c02 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2862,10 +2862,10 @@ merge(Compressor.prototype, {
               case "+": return +v;
               case "++":
               case "--":
-                if (e instanceof AST_SymbolRef) {
-                    var refs = e.definition().references;
-                    if (refs[refs.length - 1] === e) return v;
-                }
+                if (!(e instanceof AST_SymbolRef)) return this;
+                var refs = e.definition().references;
+                if (refs[refs.length - 1] !== e) return this;
+                return HOP(e, "_eval") ? +(this.operator[0] + 1) + +v : v;
             }
             return this;
         });
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