Hello JRuby team,

whit this code

class A
  def x(args1, args2={})
    puts args1
    puts args2
  end
end

class B < A
  def x(_,_)
    super
  end
end

B.new.x(42,43=>44)

in MRI Ruby 2.3 and JRuby 1.7 it prints

42
{43=>44}

while in JRuby 9.1.5.0 it prints

42
{}

So, using the "_" hides the second param to be used when super is called.

If the definition of x in B uses named params like

  def x(a, b)

it works as expected.

Environment

• jruby -v:
  jruby 9.1.5.0 (2.3.1) 2016-09-07 036ce39 Java HotSpot(TM) 64-Bit Server VM 25.91-b14 on 1.8.0_91-b14 +jit [linux-x86_64]
• this can be reproduced in plain irb easily.