Infinitely looping Idris process hard to spot in Idris mode

[david-christiansen]

This causes the type checker to loop forever:

module Death
import Providers
%language TypeProviders

%assert_total
forever : IO (Provider Bool)
forever = forever

%provide (crap : Bool) with forever

Without looking at top, we can't really see that Idris never finished type checking.

[david-christiansen]

It would seem that a buffer-local timeout would solve this.

[david-christiansen]

This was actually somewhat ameliorated by the little "!" shown if the Idris process is busy. But a timeout would still be nice to have.