Test attributes can be initialized with .= when type name has `::`
Test attributes can be initialized with .= when type name has `::`

Rakudo fix: https://github.com/rakudo/rakudo/commit/700a07747a
Bug find: https://irclog.perlgeek.de/perl6/2017-01-23#i_13976744

bitrauser/roast,bitrauser/roast,perl6/roast,dogbert17/roast,dogbert17/roast