Feature #15327: Proposal: Enable refinements to `#respond_to?`

• Status: Closed
• Assignee: -
• Target version: -

[osyo (manga osyo)]

Refinements are enabled with various contexts and methods.

• #send
• #__send__
• Symbol#to_proc
• #to_s
  • called by "#{hoge}"
• #to_proc
  • call to &:hoge
  • since ruby 2.6

I want to enable refinements for #respond_to?
I want to use it in the following case.

module StringEx
	refine String do
		def twice
			self + self
		end
	end
end

class X
	using StringEx

	def meth a
		a.twice if a.respond_to? :twice
	end
end

class Y
	def twice
		42 + 42
	end
end

x = X.new

p x.meth Y.new
# => 84

p x.meth "homu"
# => "homuhomu"

p x.meth 42
# nil

pull request : https://github.com/ruby/ruby/pull/2020

[nobu (Nobuyoshi Nakada)]

defined?(obj.method) should work.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r65920.

---

Enable refinements at Object#respond_to?

[Feature #15327] [Fix GH-2020]

From: osyo-manga [e-mail]