[ruby-core:93354] [Ruby trunk Bug#15957] Splatting nil as **kwargs

Issue #15957 has been reported by Tietew (Toru Iwase).

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Bug #15957: Splatting nil as **kwargs
https://bugs.ruby-lang.org/issues/15957

* Author: Tietew (Toru Iwase)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-06-24T15:19:49Z trunk e09afd15b7) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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Splatting nil as *array is ignored silently.
```ruby
[1, *nil]
# => [1, 2]
```

But splatting nil as **kwargs raises TypeError.
```ruby
{foo: 1, **nil}
# => no implicit conversion of nil into Hash (TypeError)
```

Is this intentional?




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