I haven't been able to find a version of Perl that actually warns in require v5.8.8;.

For Instance, 5.10.0 does: 

H:\>perl -lwe "use v5.8.8; print 6"
v-string in use/require non-portable at -e line 1.
6

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-- 
Ronald Fischer <ynnor@mm.st>

In reply to Re^2: Portable way to require Perl 5.8.8 by rovf
in thread Portable way to require Perl 5.8.8 by rovf

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