https://git.ruby-lang.org/ruby.git/commit/?id=241244739f

From 241244739f2b721ac7aa0961bd90d904c5e3fff6 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Tue, 28 Jul 2020 20:39:27 +0200
Subject: Fix arity of Hash#to_proc [Bug #12671]


diff --git a/hash.c b/hash.c
index 358b785..f6581ac 100644
--- a/hash.c
+++ b/hash.c
@@ -5285,7 +5285,7 @@ hash_proc_call(RB_BLOCK_CALL_FUNC_ARGLIST(key, hash)) https://github.com/ruby/ruby/blob/trunk/hash.c#L5285
 static VALUE
 rb_hash_to_proc(VALUE hash)
 {
-    return rb_func_proc_new(hash_proc_call, hash);
+    return rb_func_lambda_new(hash_proc_call, hash, 1, 1);
 }
 
 static VALUE
diff --git a/spec/ruby/core/hash/to_proc_spec.rb b/spec/ruby/core/hash/to_proc_spec.rb
index 8b7ddd5..73c96bd 100644
--- a/spec/ruby/core/hash/to_proc_spec.rb
+++ b/spec/ruby/core/hash/to_proc_spec.rb
@@ -29,6 +29,10 @@ describe "Hash#to_proc" do https://github.com/ruby/ruby/blob/trunk/spec/ruby/core/hash/to_proc_spec.rb#L29
       it "is a lambda" do
         @proc.should.lambda?
       end
+
+      it "has an arity of 1" do
+        @proc.arity.should == 1
+      end
     end
 
     it "raises ArgumentError if not passed exactly one argument" do
-- 
cgit v0.10.2


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