[perl #115358] [BUG] LTA error message when doing a role that's declared the same way twice in Rakudo

[Christian Bartolomaeus via RT]

This fails now with X::Role::Parametric::NoSuchCandidate:

$ perl6 -e 'role F { }; role F { }; class G does F { };'
===SORRY!===
No appropriate parametric role variant available for 'F'

Is that behaviour sound?