https://git.ruby-lang.org/ruby.git/commit/?id=fef52122b0

From fef52122b0c0dfabf947c3f016334b84a9eeb903 Mon Sep 17 00:00:00 2001
From: Chris Seaton <chris.seaton@s...>
Date: Mon, 5 Oct 2020 23:51:34 +0100
Subject: Use proc_binding rather than rb_funcall

FIX

diff --git a/proc.c b/proc.c
index b6285b1..061c6c3 100644
--- a/proc.c
+++ b/proc.c
@@ -48,6 +48,7 @@ VALUE rb_cProc; https://github.com/ruby/ruby/blob/trunk/proc.c#L48
 static rb_block_call_func bmcall;
 static int method_arity(VALUE);
 static int method_min_max_arity(VALUE, int *max);
+static VALUE proc_binding(VALUE self);
 
 #define attached id__attached__
 
@@ -2743,7 +2744,7 @@ VALUE https://github.com/ruby/ruby/blob/trunk/proc.c#L2744
 rb_callable_receiver(VALUE callable)
 {
     if (rb_obj_is_proc(callable)) {
-        VALUE binding = rb_funcall(callable, rb_intern("binding"), 0);
+        VALUE binding = proc_binding(callable);
         return rb_funcall(binding, rb_intern("receiver"), 0);
     }
     else if (rb_obj_is_method(callable)) {
-- 
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