From 3d23cce4b18bd355fa3e593245cde04c3c0300bb Mon Sep 17 00:00:00 2001
From: marija <m.selakovic89@gmail.com>
Date: Fri, 5 Feb 2016 16:56:19 +0100
Subject: [PATCH] use instanceof operator for class comparison

---
 lib/less/parser/parser.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/less/parser/parser.js b/lib/less/parser/parser.js
index e8bd7e780..1909ecf67 100644
--- a/lib/less/parser/parser.js
+++ b/lib/less/parser/parser.js
@@ -55,7 +55,7 @@ var Parser = function Parser(context, imports, fileInfo) {
 
     function expect(arg, msg, index) {
         // some older browsers return typeof 'function' for RegExp
-        var result = (Object.prototype.toString.call(arg) === '[object Function]') ? arg.call(parsers) : parserInput.$re(arg);
+        var result = (arg instanceof Function || Object.prototype.toString.call(arg) === '[object Function]') ? arg.call(parsers) : parserInput.$re(arg);
         if (result) {
             return result;
         }