augment on enums

[p6rt]

Migrated from rt.perl.org#130501 (status was 'new')

Searchable as RT130501$

[p6rt]

From @gfldex

use MONKEY-TYPING; augment class Bool { method m { say 'oi‽' } }; (1 < 2).m

# It's at least ENOSPEC and ENODOC and may be a undesired side effect of
# leaking Rakudo internals.
# It's a little confusing that `augment enum` doesn't work, because it
# works for role, class and slang.
# please update​: Raku/doc#1115
# please update​: Raku/roast#214