From: nobu@... Date: 2021-03-17T01:09:29+00:00 Subject: [ruby-core:102895] [Ruby master Bug#17725] Prepend breaks ability to override optimized methods Issue #17725 has been updated by nobu (Nobuyoshi Nakada). Subject changed from Prepend Breaks Ability to Alias to Prepend breaks ability to override optimized methods Alias is not concerned. ```ruby # bug-17725.rb String.prepend(Module.new) unless ARGV.empty? class String def + other 'blah blah' end end p 'a' + 'b' ``` ```sh $ ruby bug-17725.rb "blah blah" $ ruby bug-17725.rb 1 "ab" ``` Seems the redefinition flag is not set by prepend. ---------------------------------------- Bug #17725: Prepend breaks ability to override optimized methods https://bugs.ruby-lang.org/issues/17725#change-90955 * Author: joshuadreed (Josh Reed) * Status: Open * Priority: Normal * ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- Prepending any module to `String` and `Hash` (and possibly other or all classes?) blocks the ability to `alias` As an example: ``` ruby module Dummy; end # String.prepend(Dummy) class String alias_method(:old_plus, :+) def + other puts 'blah blah' old_plus(other) end end 'a' + 'b' > blah blah ``` ``` ruby module Dummy; end String.prepend(Dummy) class String alias_method(:old_plus, :+) def + other puts 'blah blah' old_plus(other) end end 'a' + 'b' > ``` Prepending after an `alias` does not affect the previous `alias` -- https://bugs.ruby-lang.org/ Unsubscribe: