Need to add by full name, due to ordering of loading (the name it's
attached to may not be resolved yet!). This doesn't seem to cause any
performance problems but we can revisit if it does.
Don't use the type of a scrutinee to restrict possible patterns, because
it might have been refined by a Rig0 argument that has a missing case.
Instead, generate all the possible cases and check that the generated
ones are impossible (there's no obvious change in performance)
Small change needed to fix one - assume given implicits which are of the
form x@_ arise from types. It's a bit of a hack but I don't think
there's any need for anything more complicated.
Only valid if unifying the pattern at the end doesn't solve any
metavariables. Also when elaborating applications of fromInteger etc to
constants on the LHS we need to be in expression mode, then reduce the
result later.
This was a slight difference from Blodwen that wasn't accounted for -
there might be lets in the nested environment, so when building the
expanded application type, make sure we go under them
This wasn't necessary before, since we always inlined, but since we can
now postpone things longer and don't always inline until much later, we
need to know what names everything refers to earlier.
We can't refine by a name in Rig0 because we can't assume it covers all
possibilities, so only refine by them at the end, at which point we
check that there's only one case left (otherwise we have to match on it,
which is not allowed for an erased thing)
With the --yaffle flag, you get the old behaviour which is to invoke the
checker for the core theory (and all the tests are updated appropriately
for this).
This gives useful information for expression search, because we can add
lambdas while we're still building the environment, and start looking at
locals after that.
Mostly direct from Blodwen (some minor modifications to deal with new
way of going into a new scope in the elaborator as well as the usual
bits dealing with name lookup and Glued terms)
