Case study to demonstrate jruby block bug https://github.com/jruby/jruby/issues/4217

test-block.rb

#!/usr/bin/env ruby

class Foo
  attr_reader :failed

  def initialize
    @failed = false
  end

  def [](foo, &block)
    if block_given?
      puts "block_given, block: " + block.inspect
    else
      puts "NOT block_given, block: " + block.inspect
      @failed = true
    end
  end

  def test_method(foo, &block)
    if block_given?
      puts "block_given, block: " + block.inspect
    else
      puts "NOT block_given, block: " + block.inspect
      @failed = true
    end
  end
end


f = Foo.new

puts '--'
puts RUBY_DESCRIPTION

block = proc {|r| r}

puts
puts 'Test 1: f[&block]'
f['foo', &block]

puts
puts 'Test 2: test_method(&block)'
f.test_method('foo', &block)

puts
puts 'Test 3: f.[](&block)'
f.[]('foo', &block)

puts
puts 'Test 4: f.public_send(:[], &block)'
f.public_send(:[], 'foo', &block)

if f.failed
  puts 'FAILED'
  exit 1
else
  puts 'Succeeded'
end