Calling Kernel method in a subclass of SimpleDelegator fails with TypeError: bind argument must be an instance of Kernel

[jirutka]

Minimal working example:

require 'delegate'

class MyDelegator < SimpleDelegator

  def initialize
    super String
  end

  def warn_me
    warn 'FIRE!'
  end
end

MyDelegator.new.warn_me

Expected output:

FIRE!

Tested on MRI 1.9.3, 2.1.2 and 2.2.0.

Actual output on jruby-9000-dev:

TypeError: bind argument must be an instance of Kernel
            bind at org/jruby/RubyUnboundMethod.java:105
  method_missing at /Users/jimmy/.rbenv/versions/jruby-9000-dev/lib/ruby/stdlib/delegate.rb:89
       warn_me_3 at delegator.rb:10
      __script__ at delegator.rb:14

Tested on:

jruby 9.0.0.0-SNAPSHOT (2.2.0p0) 2015-01-15 4142c8d Java HotSpot(TM) 64-Bit Server VM 25.0-b70 on 1.8.0-b132 +jit [darwin-x86_64]

Workaround:

require 'delegate'

class SimpleDelegator
  def warn(*msg)
    Kernel.warn(*msg)
  end
end

[headius]

Confirmed...seems like our logic for binding an unbound method is not detecting Kernel in hierarchy.

[headius]

Ahh right...UnboundMethod was changed recently to allow module methods to be bound to any object. Fixing.

[jirutka]

Great, it works now. Thanks!