[ruby-core:93712] [Ruby master Feature#15973] Make it so Kernel#lambda always return a lambda

Issue #15973 has been updated by akr (Akira Tanaka).


Eregon (Benoit Daloze) wrote:

> With current semantics, it returns `:early_return`.
> With the proposed change, it returns `:method_return_value`.
> That's very surprising, isn't it?

I agree.

The lambda-ness of Proc object affects control flow: the behavior of "return" and "break".

If lambda(&b) changes the lambda-ness of b, two control flow can exist.
I think no programmer want to consider two control flow when implementing one block.




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Feature #15973: Make it so Kernel#lambda always return a lambda
https://bugs.ruby-lang.org/issues/15973#change-79345

* 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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