Refinements causes "ArgumentError: tried to create Proc object without a block"

[andy-twosticks]

Environment

%: ruby -v
jruby 9.0.5.0 (2.2.3) 2016-01-26 7bee00d OpenJDK 64-Bit Server VM 24.91-b01 on 1.7.0_91-mockbuild_2015_11_20_16_53-b00 +jit [linux-amd64]

%: uname -a
Linux centos7andy.jhallpr.com 3.10.0-327.4.4.el7.x86_64 #1 SMP Tue Jan 5 16:07:00 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Example code appears to trigger the behaviour in plain jRuby without any gems being required.

Expected Behavior

I should get the same behaviour in MRI and jRuby -- the example program should not raise ArgumentError.

Example program:

module RubyPatches
  refine String do
    def does_nothing; self; end
  end   
end

module Ffile
  extend self
  using RubyPatches  # comment out this line to make the ArgumentError go away

  def fall_over
    proc {|a| a }
  end
end

Ffile.fall_over

Actual Behavior

ArgumentError: tried to create Proc object without a block
       proc at org/jruby/RubyKernel.java:1275
  fall_over at ffile3.rb:16
      <top> at ffile3.rb:23

[andy-twosticks]

Also, I can't but think that this is part of the same issue (although I'm happy to raise it as a seperate ticket if someone wants me to):

Code:

module RubyPatches
  refine String do
    def does_nothing; self; end
  end
end

module Ffile
  using RubyPatches

  FAILY = Struct.new(:one, :two)
end

...and, we run it and we get:

ArgumentError: wrong number of arguments (0 for 1)
  <module:Ffile> at ffile4.rb:14
           <top> at ffile4.rb:10

[andy-twosticks]

Might be a duplicate of #2977 ?