[ruby-core:93902] [Ruby master Bug#16018] Add a way to deprecate methods

Issue #16018 has been reported by vo.x (Vit Ondruch).

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Bug #16018: Add a way to deprecate methods
https://bugs.ruby-lang.org/issues/16018

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [i386-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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Since #11398, We have `Module#deprecate_constant` available. But I wonder, why we don't have a way to deprecate methods? There is already `Gem::Deprecate` [1], so may be this could be extracted and made more generic?

This might be useful on several places in Ruby code:

~~~
$ find . -name \*.rb -type f -exec grep -r '[^_]warn.*deprecate' {} \; | wc -l
66
~~~

[1]: https://github.com/ruby/ruby/blob/master/lib/rubygems/deprecate.rb



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