From 252fc65558e40e5e0a451f8fe3f2d5ae7a639457 Mon Sep 17 00:00:00 2001
From: thorn0 <georgii.dolzhykov@stuzo.com>
Date: Sat, 18 Jan 2014 15:16:43 +0200
Subject: [PATCH] Advanced way to specify if a function call might have side
 effects. #400

---
 lib/compress.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/compress.js b/lib/compress.js
index 4c4cf977..401a1c75 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -896,6 +896,7 @@ merge(Compressor.prototype, {
         def(AST_Call, function(compressor){
             var pure = compressor.option("pure_funcs");
             if (!pure) return true;
+            if (typeof pure == "function") return pure(this);
             return pure.indexOf(this.expression.print_to_string()) < 0;
         });
 
-- 
2.34.1