Issue #16855 has been reported by tenderlovemaking (Aaron Patterson).

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Feature #16855: Add a tracepoint for warnings
https://bugs.ruby-lang.org/issues/16855

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
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I would like to add a tracepoint for warnings.  I want to do this so that DidYouMean can suggest fixes for instance variables.  I noticed did you mean [has experimental support](https://github.com/ruby/did_you_mean/blob/master/lib/did_you_mean/experimental/ivar_name_correction.rb), but it looks very complicated.  I think if we added a tracepoint for such warnings, DidYouMean can provide more helpful warnings.

I made a pull request [here](https://github.com/ruby/ruby/pull/3106)



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