[perl #67600] Cannot declare fixed-sized or explicitly autoextending arrays

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Rakudo is unable to parse any of the following declarations:

     my @a[5];
     my @b[5;4];
     my @c[*];
     my @d[5;*];
     my @e[*;4];
     my @f[*;*];

(This seems like a bug that would have already been reported, but I  
couldn't find any references to it in the request tracker.)

This problem was observed on Rakudo Perl #18 ("Pittsburgh") with  
revision 39599 of Parrot on Mac OS X 10.5.6.