is there a way to not check for a code if the perl isnt GT 5.10 ? 
if ( $^V gt 'v5.10.0' )
        {
        @diff = grep { ! ({ $_, 0 } ~~ @inst) } @insttab;
        }
else
        {
        @hdiff{ @insttab } = undef;
        delete @hdiff{ @inst };
        @diff = keys %hdiff;
        }

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In reply to compilation error on 5.8 with $^V gt 'v5.10.0' by gabrielsousa

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