errors/receiver/lookup_parens.rb

tests/_examples/errors/receiver/lookup_parens.rb in the metorex repository.

def caught
  yield
rescue NameError => error
  error.receiver
end

target = Object.new
puts(caught { target.doesnt_exist }.equal?(target))
puts(caught { DoesntExist }.equal?(Object))

module Namespace
  class Holder
  end
end

puts(caught { Namespace::Holder::DoesntExist }.equal?(Namespace::Holder))

class WithoutTheVariable
  def read
    @@never_set
  end
end

puts(caught { WithoutTheVariable.new.read }.equal?(WithoutTheVariable))
puts(caught { target.instance_variable_get("bad name") }.equal?(target))
puts(caught { Object.class_variable_get("bad name") }.equal?(Object))

begin
  NameError.new.receiver
rescue ArgumentError => error
  puts(error.message)
end

Output:

true
true
true
true
true
true
no receiver is available