[perl #126118] Nil.gist goes missing via type parameter

[Aleks-Daniel Jakimenko-Aleksejev via RT]

That's a nice one. Still reproducible (2017.11, HEAD(5929887))

On 2015-09-20 09:29:41, zef...@fysh.org wrote:
> $ ./perl6 -e 'sub aa (Mu:U ::T) { say T; my T $a = T; say $a.WHAT; };
> aa(Int); aa(Nil)'
> (Int)
> (Int)
> Nil
> Method 'gist' not found for invocant of class 'T'
> in sub aa at -e:1
> in block <unit> at -e:1
>
> I'm mystified as to how the gist method goes missing there. It seems
> entirely available when I'm not using a type parameter:
>
> $ ./perl6 -e 'say Int; my Int $a = Int; say $a.WHAT; say Nil; my Nil
> $b = Nil; say $b.WHAT;'
> (Int)
> (Int)
> Nil
> Nil
>
> I also don't get an error if the "= T" is omitted, which is bizarre
> because the variable contains the same value by default. The error
> doesn't occur at the time of the assignment, though: it only happens
> with the say statement.
>
> -zefram