[perl #68162] [BUG] Null PMC Access when calling Grammar.regex() in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<cognominal>  ./perl6  -e 'grammar A { token a { a } }; say "a" ~~ A.a()'
<cognominal> Null PMC access in get_integer()
* masak submits rakudobug
<masak> rakudo: grammar A { token a { a } }; A.a()
<p6eval> rakudo 18598d: OUTPUT«Null PMC access in get_integer()␤in
regex A::a [...]