[io grant] Add :D on invocant for file tests
[io grant] Add :D on invocant for file tests

This adds no new behaviour, just a better error message, since
previously we failed with either "can't look up attributes in type
object" or "no candidate for .absolute" failures.

sjn/rakudo,sjn/rakudo,rakudo/rakudo,salortiz/rakudo,tbrowder/rakudo,tbrowder/rakudo,raydiak/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,nbrown/rakudo,nbrown/rakudo,tony-o/rakudo,softmoth/rakudo,labster/rakudo,tony-o/rakudo,labster/rakudo,awwaiid/rakudo,rakudo/rakudo,labster/rakudo,tony-o/rakudo,usev6/rakudo,softmoth/rakudo,tony-o/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,awwaiid/rakudo,labster/rakudo,tony-o/rakudo,awwaiid/rakudo,rakudo/rakudo,tbrowder/rakudo,Gnouc/rakudo,usev6/rakudo,labster/rakudo,raydiak/rakudo,usev6/rakudo,softmoth/rakudo,labster/rakudo,Gnouc/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,sjn/rakudo,sjn/rakudo,jonathanstowe/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,awwaiid/rakudo,salortiz/rakudo,salortiz/rakudo,salortiz/rakudo,MasterDuke17/rakudo,rakudo/rakudo,nbrown/rakudo,salortiz/rakudo,lucasbuchala/rakudo,usev6/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,softmoth/rakudo,sjn/rakudo,softmoth/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,tbrowder/rakudo,nbrown/rakudo,raydiak/rakudo,tbrowder/rakudo,rakudo/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,tony-o/rakudo,MasterDuke17/rakudo,usev6/rakudo,raydiak/rakudo,lucasbuchala/rakudo,nbrown/rakudo,salortiz/rakudo,nbrown/rakudo,rakudo/rakudo,lucasbuchala/rakudo