This is partly to tidy things up, but also a good test for 'import as'.
Requires some internal changes since there are parts of reflection,
unelaboration and a compiler hack that rely on where things are in the
Prelude.
The Int represented the resolved name, but this isn't guaranteed to be
up to date after reloading and, worse, it doesn't display helpfully. I'm
bored of updating the tests which fail as a result!
This also fixes#407, which is about displaying the wrong name after
reloading the ttc.
There is an argument that, for import public, this should be automatic
(that is, the publicly imported things should be reexported with the
parent namespace). I decided not to do this, because another use of
import public which we do a lot in the Idris 2 code base is purely as a
convenience, where we still expect things to be in their original
namespace.
Also, where there's a choice between things being explicit and implicit,
I prefer to err on the side of explicit now.
So, if what you really want in an API is to reexport, you can do that,
but explicitly.
Instead of just the cursory name update that we used to do (which didn't
work properly anyway for a lot of reasons), now we add aliases for all
the names in the imported module.
So, like Idris 1, every global has a canonical name by which we can
refer to it, but it can also have aliases via "import ... as".
If we have a delayed thing, but we don't yet know the expected type,
don't commit to forcing because the expected type might turn out to be a
delay.
Fixes#395
'convert' doesn't solve holes, so might reject things that are solvable.
This can be an issue when resolving interfaces, because we were using
convert for arguments of the invertible holes that arise when trying to
resolve them. Fixes#66.
We need to make sure they are inferred again when elaborating methods,
so substitute in a _ in method types before substituting in the explicit
parameters.
In future, it might (probably will) also be useful to allow giving the
implicit parameters explicitly when defining implementations.
Fixes#374
