From: XrXr@...
Date: 2019-07-09T14:32:18+00:00
Subject: [ruby-core:93635] [Ruby master Feature#15973] Make it so Kernel#lambda always return a lambda

Issue #15973 has been updated by alanwu (Alan Wu).


> Can I ask you why you need this feature? 

I want to be able to forward a block to `Kernel#lambda`.

`Kernel#lambda` is in a weird spot. Even though it's a method, making it behave like one has the unfortunate side-effect of allowing proc transformation.
On the other hand, restricting it to just literal blocks is fairly magical and makes it just another way to do stabby lambda.
It seems like there is no perfect solution here.
I don't feel too strongly about my proposal. Banning block-pass to `Kernel#lambda` sounds good to me too if others are not comfortable with making proc-to-lambda transformation more accessible.

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Feature #15973: Make it so Kernel#lambda always return a lambda
https://bugs.ruby-lang.org/issues/15973#change-79243

* Author: alanwu (Alan Wu)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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When Kernel#lambda receives a Proc that is not a lambda,
it returns it without modification. l propose changing `Kernel#lambda`
so it always returns a lambda.

Calling a method called lambda and having it effective do nothing was
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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