[ruby-core:119742] [Ruby master Feature#20864] Support `error:` keyword to `Kernel#warn`

["Dan0042 (Daniel DeLorme) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20864 has been updated by Dan0042 (Daniel DeLorme).


I think I agree with the general idea but I'm not sure if the proposal is what I think it is. It's a bit thin about what happens with this "error" keyword exactly. So is the idea that this meta-information would be forwarded to another method to decide what to do with it? Are we talking about extending `Warning.warn` to work like: `warn(*args, **opts)` -> `Warning.warn(formatted_str, **opts)`

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Feature #20864: Support `error:` keyword to `Kernel#warn`
https://bugs.ruby-lang.org/issues/20864#change-110406

* Author: ioquatix (Samuel Williams)
* Status: Open
----------------------------------------
`Kernel#warn` is extremely useful.

It is possible to include some details about the current caller using `uplevel` for the current call stack. But it is not possible to include details about errors.

I'd like to propose another extension to log errors.

```ruby
begin
  # some work
rescue => error
  warn "An error occurred!", error: error
end
```

Such a feature would allow us to log errors using a standard interface.

I don't have an opinion about the implementation, but I wanted to get feedback on the interface.



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