* fix#10339 by checking for nkObjConstr
* revert check for nkObjConstr, return type from nkEmpty node
The correct type needed in `semObjConstr` to fix#10339 is indeed
available, but attached to an `nkEmpty` node. These were previously
discarded in `semTypeNode`, which is used to extract the type for the
object.
* simplify return of PType from `nkEmpty`
* also fixes#9866, add test case
This also makes the first baby steps towards a sound treatment of
higher-order kinds (type type int).
Adds test cases showcasing the new features.
* Also fixes breakage after the rebase