$ perl562 -e 'use v5.8.0'
Perl v5.8.0 required--this is only v5.6.2, stopped at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl562 -e 'use 5.8.0'
Perl v5.8.0 required--this is only v5.6.2, stopped at -e line 1.
BEGIN failed--compilation aborted at -e line 1.