errors/exception_method_aliases_no_parens.rb

tests/_examples/errors/exception_method_aliases_no_parens.rb in the metorex repository.

# A subclass of an exception class can give the class's own methods another
# name, as RubyGems names `SystemExit#status` `exit_code`.
class Leaving < SystemExit
  alias_method :exit_code, :status
  alias_method :clean?, :success?
end

leaving = Leaving.new 3, "closing the ledger"
p [leaving.exit_code, leaving.clean?, Leaving.new(0).clean?]
p leaving.respond_to? :exit_code
p Leaving.instance_method(:exit_code).name

Output:

[3, false, true]
true
:exit_code