Re: RFC 12 (v2) variable usage warnings

[Steve Fink]

Tom Christiansen wrote:
> 
> >Anything else? Any opinion on whether eval "" should do what it does
> >now, and be invisible for the purposes of this analysis; or if it should
> >be assumed to instead both use and initialize all visible variables? The
> >former produces more spurious warnings, the latter misses many errors.
> 
> You have to assume eval STRING can do anything.
> 
> --tom

"have to"? Perl5 doesn't.

% perl -we '$x = 3; $v = "x"; eval "\$$v++"'
Name "main::x" used only once: possible typo at -e line 1.

I'd rather think of it as a cost-benefit tradeoff.