https://git.ruby-lang.org/ruby.git/commit/?id=d45466dc5b

From d45466dc5b9b45d5b78d161fc86265e6e19d6e1e Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Fri, 26 Feb 2021 10:06:30 -0800
Subject: Oops! Add another test and fix to_proc implementation

---
 ext/fiddle/lib/fiddle/function.rb |  3 ++-
 test/fiddle/test_function.rb      | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/ext/fiddle/lib/fiddle/function.rb b/ext/fiddle/lib/fiddle/function.rb
index f9910a0..dc2e3e6 100644
--- a/ext/fiddle/lib/fiddle/function.rb
+++ b/ext/fiddle/lib/fiddle/function.rb
@@ -22,7 +22,8 @@ module Fiddle https://github.com/ruby/ruby/blob/trunk/ext/fiddle/lib/fiddle/function.rb#L22
 
     # Turn this function in to a proc
     def to_proc
-      lambda { |*args| self.call(*args) }
+      this = self
+      lambda { |*args| this.call(*args) }
     end
   end
 end
diff --git a/test/fiddle/test_function.rb b/test/fiddle/test_function.rb
index 5dc456b..a5284e0 100644
--- a/test/fiddle/test_function.rb
+++ b/test/fiddle/test_function.rb
@@ -115,6 +115,17 @@ module Fiddle https://github.com/ruby/ruby/blob/trunk/test/fiddle/test_function.rb#L115
       assert_equal("123", str.to_s)
     end
 
+    def test_function_as_method
+      f = Function.new(@libc['strcpy'], [TYPE_VOIDP, TYPE_VOIDP], TYPE_VOIDP)
+      klass = Class.new do
+        define_singleton_method(:strcpy, &f)
+      end
+      buff = +"000"
+      str = klass.strcpy(buff, "123")
+      assert_equal("123", buff)
+      assert_equal("123", str.to_s)
+    end
+
     def test_nogvl_poll
       # XXX hack to quiet down CI errors on EINTR from r64353
       # [ruby-core:88360] [Misc #14937]
-- 
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