https://git.ruby-lang.org/ruby.git/commit/?id=7cc1cd3d1e

From 7cc1cd3d1ed1d482ea2ec247fa6a4ad0f044418a Mon Sep 17 00:00:00 2001
From: ksss <co000ri@g...>
Date: Mon, 24 Oct 2016 11:42:31 +0900
Subject: Module#define_method: Add UnboundMethod to expected classes


diff --git a/proc.c b/proc.c
index 667b86a..ca6e671 100644
--- a/proc.c
+++ b/proc.c
@@ -2068,7 +2068,7 @@ rb_mod_define_method(int argc, VALUE *argv, VALUE mod) https://github.com/ruby/ruby/blob/trunk/proc.c#L2068
 	}
 	else {
 	    rb_raise(rb_eTypeError,
-		     "wrong argument type %s (expected Proc/Method)",
+		     "wrong argument type %s (expected Proc/Method/UnboundMethod)",
 		     rb_obj_classname(body));
 	}
     }
-- 
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