Re: scratch/accurate-warning-pos: Solid progress: the branch now bootstraps.

[Paul Eggert]

Alan Mackenzie wrote:

> How do other Lisp compilers work?  They must have ways of keeping track
> of line and column numbers.

I'm pretty sure they don't redefine the meaning of 'eq'....

> The problem is that when compilation is in progress,
>
>      (eq 'foo '#<symbol foo at 666>)
>
> has got to return t.

Why not change the byte-compiler to use 'eq-ignoring-symbol-pos' (or whatever 
you want to call it) instead of 'eq'? The byte compiler could do this for every 
occurrence of 'eq' in every user macro, as well as in its own code. This should 
let ordinary Lisp code run at full speed; only compilation would be slowed down.