raise_kwargs_test.rb

class MyError < StandardError
  def initialize(**options)
    p options
  end
end

raise MyError, foo: :bar

$ ruby /Users/r7kamura/Desktop/raise_kwargs_test.rb
/Users/r7kamura/Desktop/raise_kwargs_test.rb:7: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/Users/r7kamura/Desktop/raise_kwargs_test.rb:2: warning: The called method `initialize' is defined here
{:foo=>:bar}
Traceback (most recent call last):
/Users/r7kamura/Desktop/raise_kwargs_test.rb:7:in `<main>': MyError (MyError)