So far the "either" type only handled "flat" types, so you couldn't do
something like:
type = either int (submodule {
options = ...;
});
Not only caused this the submodule's options not being checked but also
not show up in the documentation.
This was something we stumbled on with #13916.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Cc: @edolstra
0f0805b51a