…ignature for

…pe or newtype it's for

…o know when/if it happens

…to date

…pe class idents do something similar.

…erence

…figure out if it needs to be rebuilt or not.

We still rebuild too many things wrt type classes.
We don't track type aliases at all since they get desugared earlier, which is a problem.

Not sure if we already did or not, or if this changed anything. I couldn't think of a test case that failed without this change. It's possible that removing the notimpl1213 and notimpl1214 crashes was all that was needed.

…on't know if it's the correct thing to do but crashing sure isn't.

…rrors

… holes are still available. I've never found wildcard errors useful when typed holes are right there.

…arsing externs files all the time. Enabled via PURS_LOOP_EVERY_SECOND=1 envvar.