Re: byte-optimize-set causes spurious byte compiler warnings

[Stefan Monnier]

> >>   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map)
> >
> > The code needs a (defvar tool-bar-map) to declare that
> > tool-bar-map is an externally defined variable.
> 
> I know that defvar silences the warning.  But what's the point?  It
> serves no other useful purpose than pacifying the byte compiler.

If the code correctly puts defvars where needed, then the compiler
can use lexical scoping for non-defvarred variables, which can
lead to significant optimizations.


        Stefan