Bug #15957: Splatting nil as **kwargs

• Status: Closed
• 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

[Tietew (Toru Iwase)]

Splatting nil as *array is ignored silently.

[1, *nil]
# => [1, 2]

But splatting nil as **kwargs raises TypeError.

{foo: 1, **nil}
# => no implicit conversion of nil into Hash (TypeError)

Is this intentional?

[nobu (Nobuyoshi Nakada)]

• Is duplicate of Bug #15078: Hash splat of empty hash should not create a positional argument. added

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed

Fixed by #14183:

$ ruby -e 'def foo(*args); p args; end; foo(**{}); foo(**Hash.new) '
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