Useless use of a constant in void context at - line 4.
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# op.c
-$ENV{PERL_DESTRUCT_LEVEL} = 0 unless $ENV{PERL_DESTRUCT_LEVEL} > 3; # known scalar leak
+BEGIN{ $ENV{PERL_DESTRUCT_LEVEL} = 0 unless $ENV{PERL_DESTRUCT_LEVEL} > 3; } # known scalar leak
use warnings 'unsafe' ;
my $a ; my @a = () ; my %a = () ; my $b = \@a ; my $c = \%a ;
@a =~ /abc/ ;