Environment

• JRuby version: jruby 9.2.5.0 (2.5.0) 2018-12-06 6d5a228 OpenJDK 64-Bit Server VM 25.181-b13 on 1.8.0_181-8u181-b13-2~deb9u1-b13 +jit [linux-x86_64]

Expected Behavior

Given the code below:

class A
  def foo
    puts "foo"
    self
  end
end

using(Module.new do
  refine A do
    def baz
      puts "bar"
      self
    end
  end
end)

using(Module.new do
  refine A do
    def bar
      puts "bar"
      self
    end
  end
end)

begin
  A.new.foo.baz.bar
rescue => e
  p e.message
end

begin
  A.new.foo.bar.baz
rescue => e
  p e.message
end

I expect it to print:

"foo"
"baz"
"bar"
"foo"
"bar"
"baz"

The code below worked in 9.1.7.0 (just checked: broken since 9.2.0.0).

Actual Behavior

It prints exceptions:

"foo"
"undefined method `baz' for #<A:0x1c3a4799>"
"foo"
"bar"
"undefined method `baz' for #<A:0x3043fe0e>"

If I change the order of using, the bar method becomes undefined; hence only the last added refinement for the class is activated.