Re: broken FE diagnostics wrt complex expressions

[Tom Tromey <tromey at redhat dot com>]

Tom> I suspect that there's some work fixing optimization passes.  I have
Tom> not looked but I would not be surprised if some of them pick locations
Tom> poorly when rearranging things.

Aldy> But this has nothing to do with error messages.  I mean, not initially.

Yeah, it is somewhat indirect.  It can matter if some expression's
location is later used when emitting an error.  Users will probably
benefit a lot more from work in the FE than the ME.

Aldy> 1. beginning/ending locations functionality as Joseph suggests.
Aldy> 2. make sure the parsers pick the proper token/location.
Aldy> 3. error reporting machinery

Aldy> How does this sound?  

It sounds good to me.  #1 might be hard, I have not looked into it.

ISTR Manuel having a patch for caret diagnostic output... ?

Aldy> (As is customary with me, I'm doing a lot of hand-waving, because
Aldy> everything's a 4-5 day job in my mind-- just like tuples.  I'm sure
Aldy> it'll be a can of worms.)

:)

Tom