[ruby-core:93748] [Ruby master Feature#15999] KeyError#inspect does not contain receiver and key

Issue #15999 has been reported by znz (Kazuhiro NISHIYAMA).

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Feature #15999: KeyError#inspect does not contain receiver and key
https://bugs.ruby-lang.org/issues/15999

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Some exception classes accept `receiver:`, but `#inspect` does not show such information.
How about adding receiver (and key) to `#inspect`?

```
KeyError.new("message", receiver: :receiver, key: :key).inspect #=> "#<KeyError: message>"
NameError.new("message", receiver: :receiver).inspect           #=> "#<NameError: message>"
NoMethodError.new("message", receiver: :receiver).inspect       #=> "#<NoMethodError: message>"
```



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