Implement Enumerator::Yielder#to_proc

Author: bjfish

CHANGELOG.md

@@ -33,6 +33,7 @@ Compatibility:
 * Implemented `rb_make_exception`.
 * `**kwargs` now accept non-Symbol keys like Ruby 2.7.
 * Updated the Unicode Emoji version (#2173, @wildmaples).
+* Added `Enumerator::Yielder#to_proc`.
 
 Performance:
 

src/main/ruby/truffleruby/core/enumerator.rb

@@ -248,6 +248,10 @@ def <<(*args)
 
       self
     end
+
+    def to_proc
+      self.method(:yield).to_proc
+    end
   end
 
   class Generator

test/mri/excludes/TestEnumerator.rb

@@ -15,4 +15,3 @@
 exclude :test_produce, "needs investigation"
 exclude :test_each_slice_size, "needs investigation"
 exclude :test_size_for_enum_created_from_enumerable, "needs investigation"
-exclude :test_yielder, "needs investigation"