[ruby-core:93711] [Ruby master Feature#15973] Make it so Kernel#lambda always return a lambda

Issue #15973 has been updated by shyouhei (Shyouhei Urabe).


Yes, I can compromise with delegation scheme, as long as it leaves its own frame in the call stack.  An optional method for a proc to prevent such delegation is desirable but can be added later.

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Feature #15973: Make it so Kernel#lambda always return a lambda
https://bugs.ruby-lang.org/issues/15973#change-79344

* 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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