From 4d92d2e1aa121cc81ccef0e8a64683bae56cfbb9 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 24 Dec 2013 07:02:37 +0900
Subject: string type check based on #to_str to encourage duck typing; #1616

---
 mrblib/string.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrblib/string.rb b/mrblib/string.rb
index 53e7c10c0..0d8ed4d01 100644
--- a/mrblib/string.rb
+++ b/mrblib/string.rb
@@ -137,7 +137,7 @@ class String
   ##
   # ISO 15.2.10.5.5
   def =~(re)
-    if re.is_a? String
+    if re.respond_to? :to_str
       raise TypeError, "type mismatch: String given"
     end
     re =~ self
-- 
cgit v1.2.3