[perl #131324] Inheriting from lexical classes seems borked

[via RT]

# New Ticket Created by  Elizabeth Mattijsen 
# Please include the string:  [perl #131324]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=131324 >


Should this work?   If not, why not?  What would be the way to inherit from 
lexical classes in other compunits?


./A.pm6:
my class A {}

./B.pm6:
my class B {
    use A;
    also is A;
}

$ PERL6LIB=. 6 'use B'
===SORRY!=== Error while compiling /Users/liz/Github/rakudo.moar/B.pm6 (B)
Invalid typename 'A'
at /Users/liz/Github/rakudo.moar/B.pm6 (B):4
------>     also does A⏏;