From 8c356c4cac4b329621b5d2f59774fc8dced8e793 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Tue, 13 Feb 2018 06:14:27 +0800
Subject: [PATCH] collapse within unary expressions

---
 lib/compress.js            | 3 +++
 test/compress/functions.js | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/compress.js b/lib/compress.js
index ad691f7a..a161b457 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1260,6 +1260,8 @@ merge(Compressor.prototype, {
                 } else if (expr instanceof AST_Unary) {
                     if (expr.operator == "++" || expr.operator == "--") {
                         candidates.push(hit_stack.slice());
+                    } else {
+                        extract_candidates(expr.expression);
                     }
                 } else if (expr instanceof AST_VarDef) {
                     if (expr.value) {
@@ -1314,6 +1316,7 @@ merge(Compressor.prototype, {
                     return find_stop(parent, level + 1, true);
                 }
                 if (parent instanceof AST_Switch) return node;
+                if (parent instanceof AST_Unary) return node;
                 if (parent instanceof AST_VarDef) return node;
                 return null;
             }
diff --git a/test/compress/functions.js b/test/compress/functions.js
index a964f104..2c034559 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -1343,7 +1343,7 @@ issue_2630_4: {
         var x = 3, a = 1, b = 2;
         (function() {
             (function() {
-                while (--x >= 0 && void (a++, b += a));
+                while (--x >= 0 && void (b += ++a));
             })();
         })();
         console.log(a);