Issue #17143 has been updated by matz (Yukihiro Matsumoto).


Adding category to the warning seems a good idea. But I have the following concerns:

* Category should be specified only by symbols
* Category symbols must be among predefined set (to avoid typos and confusions)

Matz.


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Feature #17143: Improve support for warning categories
https://bugs.ruby-lang.org/issues/17143#change-87687

* Author: jeremyevans0 (Jeremy Evans)
* Status: Open
* Priority: Normal
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Support was recently added for Warning.warn to accept a `category` keyword.  However, the initial implementation was limited to having `rb_warn_deprecated` and `rb_warn_deprecated_to_remove` use the `:deprecated` value for the `category` keyword.

It doesn't make sense to me to have a `category` keyword if it is only used for deprecation, so I propose we extend the support so that `Kernel#warn` accepts a category keyword (for Ruby-level warnings) and `rb_category_warn` and `rb_category_warning` functions be added to the C-API (for C-level warnings).  I also propose that we change existing `rb_warn` and `rb_warning` calls to `rb_category_warn` and `rb_category_warning`, so that all warnings issued by core Ruby are issued with an appropriate category.

I have implemented support for this in a pull request: https://github.com/ruby/ruby/pull/3508



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