Calling Kernel method in a subclass of SimpleDelegator fails with NoMethodError private method

[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:

NoMethodError: private method `warn' called for String:MyDelegator
   warn_me_3 at delegator.rb:10
  __script__ at delegator.rb:14

Workaround:

require 'delegate'

class SimpleDelegator
  # https://github.com/jruby/jruby/issues/2412
  def warn(*msg)
    Kernel.warn(*msg)
  end
end

[headius]

Very likely fixed by the move back to pure-Ruby delegate library in #1370.

[jirutka]

Thanks, I’ll try it. Do you know how often Travis fetches a new version of jruby-head?

[jirutka]

Well, now it raises another error:

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

ruby --version
jruby 9.0.0.0-SNAPSHOT (2.2.0p0) 2015-01-11 0c11cad Java HotSpot(TM) 64-Bit Server VM 25.0-b70 on 1.8.0-b132 +jit [darwin-x86_64]

Should I open another issue for that…?

[jirutka]

Reported in #2463.