Issue #15973 has been updated by Eregon (Benoit Daloze).


Yes, sorry I should not have mentioned `define_method` here, even though it's related it's not the main topic.
I'll make a new issue for it.

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Feature #15973: Let Kernel#lambda always return a lambda
https://bugs.ruby-lang.org/issues/15973#change-83761

* Author: alanwu (Alan Wu)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 2.8
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When Kernel#lambda receives a Proc that is not a lambda,
it returns it without modification. l propose to change `Kernel#lambda`
so it always returns a lambda.

Calling a method called lambda and having it do nothing in effect is
not very intuitive.

https://github.com/ruby/ruby/pull/2262

Judging from marcandre's investigation here: https://bugs.ruby-lang.org/issues/15620#note-1,
changing the behavior should not cause much breakage, if any.


This also happens to fix [Bug #15620]



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