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Define Singleton#duplicable? and return false

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This commit is contained in:
Jean Boussier 2021-01-12 16:44:59 +01:00
parent b453bff351
commit a65b8a00cb
2 changed files with 12 additions and 1 deletions
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11
activesupport/lib/active_support/core_ext/object/duplicable.rb
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@ -47,3 +47,14 @@ class UnboundMethod
false
end
end
require "singleton"
module Singleton
# Singleton instances are not duplicable:
#
# Class.new.include(Singleton).instance.dup # TypeError (can't dup instance of singleton
def duplicable?
false
end
end

2
activesupport/test/core_ext/object/duplicable_test.rb
View file

@ -6,7 +6,7 @@ require "active_support/core_ext/object/duplicable"
require "active_support/core_ext/numeric/time"
class DuplicableTest < ActiveSupport::TestCase
RAISE_DUP = [method(:puts), method(:puts).unbind]
RAISE_DUP = [method(:puts), method(:puts).unbind, Class.new.include(Singleton).instance]
ALLOW_DUP = ["1", "symbol_from_string".to_sym, Object.new, /foo/, [], {}, Time.now, Class.new, Module.new, BigDecimal("4.56"), nil, false, true, 1, 2.3, Complex(1), Rational(1)]
def test_duplicable