##
BEGIN { die "// not implemented in Perl $]\n" if $] < 5.010 }
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##
BEGIN { die "// not implemented in Perl $]\n" if ! eval "undef() // 1" }
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perl5.8 -e'my $x= undef() // 1;'
Search pattern not terminated ...
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use v5.14 "Your Perl is old. Please don't waste my time. Go away until you upgrade.";