It seems the variable as seen my the subset declaration is undefined.
Here's a simplified example:

> my $must_be='b'
> subset OneStr of Str where $_ eq $must_be;
> my OneStr $x = 'b'
Use of uninitialized value $must_be of type Any in string context

I don't know if that's a bug in Rakudo, or if it makes sense in some bigger

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