Prism accepts double wildcard with no required fields in pattern match

[herwinw]

Prism accepts double wildcard with no required fields in pattern match

[herwinw]

The same thing can happen with an ArrayPatternNode:

[1,2,3,4] => *a, *b, 4

This too gets rejected by MRI

ruby -e '[1,2,3,4] => *a, *b, 4'
-e:1: syntax error, unexpected *
[1,2,3,4] => *a, *b, 4
ruby: compile error (SyntaxError)

Switching the parser to Prism (ruby 3.4-dev, the default included prism 0.30) results in a segfault.

In this case, MRI even rejects syntax that I would think is not ambiguous:

ruby -e '[1,2,3,4] => *a, 2, *b, 4'
-e:1: syntax error, unexpected ',', expecting end-of-input
[1,2,3,4] => *a, 2, *b, 4
ruby: compile error (SyntaxError)

This still results in a segfault when using --parser=prism

[kddnewton]

Thanks @herwinw! I'll get these fixed