[ruby-core:119729] [Ruby master Feature#20864] Support `error:` keyword to `Kernel#warn`

Issue #20864 has been updated by Eregon (Benoit Daloze).


Why not include the error directly in the warning message?
It seems that would just work better with the whole `Warning.warn` system and existing handling of warnings.

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Feature #20864: Support `error:` keyword to `Kernel#warn`
https://bugs.ruby-lang.org/issues/20864#change-110396

* 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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