Hello,

There's a behavioral difference between JRuby and MRI when calling #each. If a lambda with a return statement is called inside #each, the result of the latter will be returned rather than the lambda's one:

require 'minitest/autorun'

class LambdaTest < Minitest::Test
  def bar(&b)
    [1].each { -> { self.instance_exec(&b) }.call }
  end

  def test_return_with_lambda
    assert_equal "foo", bar { return "foo" }
  end
end

Have a nice day!