bug#60830: 30.0.50; The *Compilation* buffer does not recognize Lua errors

[Stefan Monnier]

>> I wonder is we could come with a way to figure out tell tale signs
>> that particular tools might be (or can't be) used.
> I can think of some dodgy heuristics that will make nobody happy but that's 
> it.

How 'bout we only activate a handful of rules, and then use a "low
priority background" search for matches to the non-active rules and when
we find such a match we bring it to the users' attention that maybe they
should enable that extra rule?


        Stefan