Current Perl documentation can be found at perldoc.perl.org.
Here is our local, out-dated (pre-5.6) version:
The $^W
variable (documented in the perlvar manpage) controls runtime warnings for a block:
{ local $^W = 0; # temporarily turn off warnings $a = $b + $c; # I know these might be undef }
Note that like all the punctuation variables, you cannot currently use
my()
on $^W
, only
local().
A new use warnings
pragma is in the works to provide finer control over all this. The curious
should check the perl5-porters mailing list archives for details.