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

[Paul Eggert]

I didn't realize until now that this branch makes EQ slower for everybody, for 
what seems to be a relatively minor issue (i.e., more accurate diagnostics). 
Surely there is a better way.

Why not add an option to 'read' so that its returned value contains 
symbol-with-pos objects instead of symbol objects? That way, programs like the 
Elisp compiler that read objects can generate more accurate diagnostics without 
having to slow down EQ for everybody.