perl/t/lib/warnings/9uninit

DAPM 4/2004.

Test the appearance of variable names in "Use of uninitialized value"
warnings.

The following ops aren't tested, mainly because they do IO or non-portable
stuff:

    send recv bind conect listen accept shutdown chdir chown chroot unlink
    chmod utime rename link symlink readlink mkdir rmdir opendir seekdir
    system exec kill getpgrp alarm sleep dofile require gethostbyname
    gethostbyaddr getnetbyname getnetbyaddr getprotobyname getprotobynumber
    getservbyname getservbyport sethostent setnetent setprotoent setservent
    getpwnam getpwuid getgrnam getgrgid waitpid setpgrp setpriority
    getpriority syscall dbmopen ioctl fcntl truncate getsockopt setsockopt
    semctl semop semget msgget msgctl msgsnd msgrcv shmget shmctl shmread
    shmwrite

    ---------------------------------------------------


__END__
use warnings 'uninitialized';
my ($m1, $m2, $v);

$v = $m1 + 10;
$v = 22 + $m2;
$v = $m1 + $m2;
EXPECT
Use of uninitialized value $m1 in addition (+) at - line 4.
Use of uninitialized value $m2 in addition (+) at - line 5.
Use of uninitialized value $m2 in addition (+) at - line 6.
Use of uninitialized value $m1 in addition (+) at - line 6.
########
use warnings 'uninitialized';
use utf8;
use open qw( :utf8 :std );

$v = $à1 + 10;
$v = 22 + $ａ2;
$v = $à1 + $ａ2;
EXPECT
Use of uninitialized value $à1 in addition (+) at - line 5.
Use of uninitialized value $ａ2 in addition (+) at - line 6.
Use of uninitialized value $ａ2 in addition (+) at - line 7.
Use of uninitialized value $à1 in addition (+) at - line 7.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1, $g2);

$v = $g1 + 21;
$v = 31 + $g2;
$v = $g1 + $g2;
$v = $m1 + $g2;
EXPECT
Use of uninitialized value $g1 in addition (+) at - line 5.
Use of uninitialized value $g2 in addition (+) at - line 6.
Use of uninitialized value $g2 in addition (+) at - line 7.
Use of uninitialized value $g1 in addition (+) at - line 7.
Use of uninitialized value $g2 in addition (+) at - line 8.
Use of uninitialized value $m1 in addition (+) at - line 8.
########
use warnings 'uninitialized';
my ($m1, @ma, $v);

$v = $ma[5] + 45;
$v = 56 + $ma[6];
$v = $ma[7] + $m1;
$v = $ma[8] + $ma[9];
$v = $ma[-1] + $ma[-2];
EXPECT
Use of uninitialized value $ma[5] in addition (+) at - line 4.
Use of uninitialized value $ma[6] in addition (+) at - line 5.
Use of uninitialized value $m1 in addition (+) at - line 6.
Use of uninitialized value in addition (+) at - line 6.
Use of uninitialized value in addition (+) at - line 7.
Use of uninitialized value in addition (+) at - line 7.
Use of uninitialized value in addition (+) at - line 8.
Use of uninitialized value in addition (+) at - line 8.
########
use warnings 'uninitialized';
my ($v);
my @mau = (undef) x 258;
my %mhu = ('foo', undef, 'bar', undef);

$v = $mau[5] + 23;
$v = $mau[-5] + 45;
$v = 56 + $mau[6];
$v = 78 + $mau[-6];
$v = $mau[7] + $mau[8];
$v = $mau[256] + $mau[257];
$v = $mau[-1] + $mau[-2];
$v = $mhu{foo} + $mhu{bar};
EXPECT
Use of uninitialized value $mau[5] in addition (+) at - line 6.
Use of uninitialized value $mau[-5] in addition (+) at - line 7.
Use of uninitialized value $mau[6] in addition (+) at - line 8.
Use of uninitialized value $mau[-6] in addition (+) at - line 9.
Use of uninitialized value $mau[8] in addition (+) at - line 10.
Use of uninitialized value $mau[7] in addition (+) at - line 10.
Use of uninitialized value $mau[257] in addition (+) at - line 11.
Use of uninitialized value $mau[256] in addition (+) at - line 11.
Use of uninitialized value $mau[-2] in addition (+) at - line 12.
Use of uninitialized value $mau[-1] in addition (+) at - line 12.
Use of uninitialized value $mhu{"bar"} in addition (+) at - line 13.
Use of uninitialized value $mhu{"foo"} in addition (+) at - line 13.
########
use warnings 'uninitialized';
my ($v);
our (@ga);

$v = $ga[8] + 21;
$v = $ga[-8] + 46;
$v = 57 + $ga[9];
$v = 58 + $ga[-9];
$v = $ga[10] + $ga[11];
$v = $ga[-10] + $ga[-11];
EXPECT
Use of uninitialized value $ga[8] in addition (+) at - line 5.
Use of uninitialized value $ga[-8] in addition (+) at - line 6.
Use of uninitialized value $ga[9] in addition (+) at - line 7.
Use of uninitialized value $ga[-9] in addition (+) at - line 8.
Use of uninitialized value in addition (+) at - line 9.
Use of uninitialized value in addition (+) at - line 9.
Use of uninitialized value in addition (+) at - line 10.
Use of uninitialized value in addition (+) at - line 10.
########
use warnings 'uninitialized';
my ($v);
our @gau = (undef) x 258;
our %ghu = ('foo', undef, 'bar', undef);

$v = $gau[8] + 46;
$v = $gau[-8] + 47;
$v = 57 + $gau[9];
$v = 57 + $gau[-9];
$v = $gau[10] + $gau[11];
$v = $gau[256] + $gau[257];
$v = $gau[-1] + $gau[-2];
$v = $ghu{foo} + $ghu{bar};
EXPECT
Use of uninitialized value $gau[8] in addition (+) at - line 6.
Use of uninitialized value $gau[-8] in addition (+) at - line 7.
Use of uninitialized value $gau[9] in addition (+) at - line 8.
Use of uninitialized value $gau[-9] in addition (+) at - line 9.
Use of uninitialized value $gau[11] in addition (+) at - line 10.
Use of uninitialized value $gau[10] in addition (+) at - line 10.
Use of uninitialized value $gau[257] in addition (+) at - line 11.
Use of uninitialized value $gau[256] in addition (+) at - line 11.
Use of uninitialized value $gau[-2] in addition (+) at - line 12.
Use of uninitialized value $gau[-1] in addition (+) at - line 12.
Use of uninitialized value $ghu{"bar"} in addition (+) at - line 13.
Use of uninitialized value $ghu{"foo"} in addition (+) at - line 13.
########
use warnings 'uninitialized';
my ($v);
our @gau = (undef) x 258;
our %ghu = ('foo', undef, 'bar', undef);
my @mau = (undef) x 258;
my %mhu = ('foo', undef, 'bar', undef);

my $i1 = 10;
my $i2 = 20;
my $i3 = 2000;
my $k1 = 'foo';
my $k2 = 'bar';
my $k3 = 'baz';
$v = $mau[$i1] + $mau[$i2];
$v = $gau[$i1] + $gau[$i2];
$v = $gau[$i1] + $gau[$i3];
$v = $mhu{$k1} + $mhu{$k2};
$v = $ghu{$k1} + $ghu{$k2};
$v = $ghu{$k1} + $ghu{$k3};
EXPECT
Use of uninitialized value $mau[20] in addition (+) at - line 14.
Use of uninitialized value $mau[10] in addition (+) at - line 14.
Use of uninitialized value $gau[20] in addition (+) at - line 15.
Use of uninitialized value $gau[10] in addition (+) at - line 15.
Use of uninitialized value in addition (+) at - line 16.
Use of uninitialized value $gau[10] in addition (+) at - line 16.
Use of uninitialized value $mhu{"bar"} in addition (+) at - line 17.
Use of uninitialized value $mhu{"foo"} in addition (+) at - line 17.
Use of uninitialized value $ghu{"bar"} in addition (+) at - line 18.
Use of uninitialized value $ghu{"foo"} in addition (+) at - line 18.
Use of uninitialized value in addition (+) at - line 19.
Use of uninitialized value $ghu{"foo"} in addition (+) at - line 19.
########
use warnings 'uninitialized';
my ($m1, $m2, @ma, %mh, $v);
our ($g1, $g2, @ga, %gh);

$v = $ma[$m1];
$v = $ma[$g1];
$v = $ga[$m2];
$v = $ga[$g2];

$v = $mh{$m1};
$v = $mh{$g1};
$v = $gh{$m2};
$v = $gh{$g2};

$v = $m1+($m2-$g1);
$v = $ma[$ga[3]];
$v = $ga[$ma[4]];
EXPECT
Use of uninitialized value $m1 in array element at - line 5.
Use of uninitialized value $g1 in array element at - line 6.
Use of uninitialized value $m2 in array element at - line 7.
Use of uninitialized value $g2 in array element at - line 8.
Use of uninitialized value $m1 in hash element at - line 10.
Use of uninitialized value $g1 in hash element at - line 11.
Use of uninitialized value $m2 in hash element at - line 12.
Use of uninitialized value $g2 in hash element at - line 13.
Use of uninitialized value $g1 in subtraction (-) at - line 15.
Use of uninitialized value $m2 in subtraction (-) at - line 15.
Use of uninitialized value $m1 in addition (+) at - line 15.
Use of uninitialized value $ga[3] in array element at - line 16.
Use of uninitialized value $ma[4] in array element at - line 17.
########
use warnings 'uninitialized';
my (@ma, %mh, $v);
our (@ga, %gh);

$v = sin $ga[1000];
$v = sin $ma[1000];
$v = sin $gh{foo};
$v = sin $mh{bar};

$v = sin $ga[$$];
$v = sin $ma[$$];
$v = sin $gh{$$};
$v = sin $mh{$$};
EXPECT
Use of uninitialized value $ga[1000] in sin at - line 5.
Use of uninitialized value $ma[1000] in sin at - line 6.
Use of uninitialized value $gh{"foo"} in sin at - line 7.
Use of uninitialized value $mh{"bar"} in sin at - line 8.
Use of uninitialized value within @ga in sin at - line 10.
Use of uninitialized value within @ma in sin at - line 11.
Use of uninitialized value within %gh in sin at - line 12.
Use of uninitialized value within %mh in sin at - line 13.
########
use warnings 'uninitialized';
my (@mat, %mht, $v);
sub X::TIEARRAY { bless [], 'X' }
sub X::TIEHASH { bless [], 'X' }
sub X::FETCH { undef }
tie @mat, 'X';
tie %mht, 'X';
my $key1 = 'akey';
my $key2 = 'bkey';
my $index1 = 33;
my $index2 = 55;

$v = sin $mat[0];
$v = $mat[0] + $mat[1];
$v = sin $mat[1000];
$v = $mat[1000] + $mat[1001];

$v = sin $mat[$index1];
$v = $mat[$index1] + $mat[$index2];

$v = sin $mht{foo};
$v = $mht{foo} + $mht{bar};

$v = sin $mht{$key1};
$v = $mht{$key1} + $mht{$key2};

$v = $1+1;
EXPECT
Use of uninitialized value $mat[0] in sin at - line 13.
Use of uninitialized value in addition (+) at - line 14.
Use of uninitialized value in addition (+) at - line 14.
Use of uninitialized value $mat[1000] in sin at - line 15.
Use of uninitialized value in addition (+) at - line 16.
Use of uninitialized value in addition (+) at - line 16.
Use of uninitialized value within @mat in sin at - line 18.
Use of uninitialized value in addition (+) at - line 19.
Use of uninitialized value in addition (+) at - line 19.
Use of uninitialized value $mht{"foo"} in sin at - line 21.
Use of uninitialized value in addition (+) at - line 22.
Use of uninitialized value in addition (+) at - line 22.
Use of uninitialized value within %mht in sin at - line 24.
Use of uninitialized value in addition (+) at - line 25.
Use of uninitialized value in addition (+) at - line 25.
Use of uninitialized value $1 in addition (+) at - line 27.
########
use warnings 'uninitialized';
my ($m1);
our ($g1, @ga);

print $ga[1000];
print STDERR $ga[1000];
print STDERR $m1, $g1, $ga[1],$m2;
print STDERR "", $ga[1],"";
EXPECT
Use of uninitialized value in print at - line 5.
Use of uninitialized value in print at - line 6.
Use of uninitialized value $m1 in print at - line 7.
Use of uninitialized value $g1 in print at - line 7.
Use of uninitialized value in print at - line 7.
Use of uninitialized value $m2 in print at - line 7.
Use of uninitialized value in print at - line 8.
########
use warnings 'uninitialized';
my ($m1);
our ($g1);

close $m1;	# exercises rv2gv
close $g1;	# exercises rv2gv
close undef;	# exercises rv2gv
EXPECT
Use of uninitialized value $m1 in ref-to-glob cast at - line 5.
Use of uninitialized value $g1 in ref-to-glob cast at - line 6.
Use of uninitialized value in ref-to-glob cast at - line 7.
########
use warnings 'uninitialized';
my ($m1, $m2, $v);
our ($g1, $g2);

$v = $$m1;
$v = $$g1;

$v = @$m1;
$v = @$g1;
$v = %$m2;
$v = %$g2;

$v = ${"foo.bar"}+1;
$v = ${"foo$m1"}+1;
$v = ${"foo$g1"}+1;
EXPECT
Use of uninitialized value $m1 in scalar dereference at - line 5.
Use of uninitialized value $g1 in scalar dereference at - line 6.
Use of uninitialized value $m1 in array dereference at - line 8.
Use of uninitialized value $g1 in array dereference at - line 9.
Use of uninitialized value $m2 in hash dereference at - line 10.
Use of uninitialized value $g2 in hash dereference at - line 11.
Use of uninitialized value in addition (+) at - line 13.
Use of uninitialized value $m1 in concatenation (.) or string at - line 14.
Use of uninitialized value in addition (+) at - line 14.
Use of uninitialized value $g1 in concatenation (.) or string at - line 15.
Use of uninitialized value in addition (+) at - line 15.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = $m1 | $m2;
$v = $m1 & $m2;
$v = $m1 ^ $m2;
$v = ~$m1;

$v = $g1 | $g2;
$v = $g1 & $g2;
$v = $g1 ^ $g2;
$v = ~$g1;
EXPECT
Use of uninitialized value $m1 in bitwise or (|) at - line 5.
Use of uninitialized value $m2 in bitwise or (|) at - line 5.
Use of uninitialized value $m1 in bitwise and (&) at - line 6.
Use of uninitialized value $m2 in bitwise and (&) at - line 6.
Use of uninitialized value $m1 in bitwise xor (^) at - line 7.
Use of uninitialized value $m2 in bitwise xor (^) at - line 7.
Use of uninitialized value $m1 in 1's complement (~) at - line 8.
Use of uninitialized value $g1 in bitwise or (|) at - line 10.
Use of uninitialized value $g2 in bitwise or (|) at - line 10.
Use of uninitialized value $g1 in bitwise and (&) at - line 11.
Use of uninitialized value $g2 in bitwise and (&) at - line 11.
Use of uninitialized value $g1 in bitwise xor (^) at - line 12.
Use of uninitialized value $g2 in bitwise xor (^) at - line 12.
Use of uninitialized value $g1 in 1's complement (~) at - line 13.
########
use warnings 'uninitialized';
my ($v);

my  $tmp1; $v = $tmp1++; # (doesn't warn)
our $tmp2; $v = $tmp2++; # (doesn't warn)
my  $tmp3; $v = ++$tmp1; # (doesn't warn)
our $tmp4; $v = ++$tmp2; # (doesn't warn)

my  $tmp5; $v = $tmp5--; # (doesn't warn)
our $tmp6; $v = $tmp6--; # (doesn't warn)
my  $tmp7; $v = --$tmp7; # (doesn't warn)
our $tmp8; $v = --$tmp8; # (doesn't warn)
EXPECT
########
use warnings 'uninitialized';

my $s1; chomp $s1;
my $s2; chop  $s2;
my ($s3,$s4); chomp ($s3,$s4);
my ($s5,$s6); chop  ($s5,$s6);
EXPECT
Use of uninitialized value $s1 in scalar chomp at - line 3.
Use of uninitialized value $s2 in scalar chop at - line 4.
Use of uninitialized value $s3 in chomp at - line 5.
Use of uninitialized value $s4 in chomp at - line 5.
Use of uninitialized value $s5 in chop at - line 6.
Use of uninitialized value $s6 in chop at - line 6.
########
use warnings 'uninitialized';
my ($m1);

local $/ =\$m1;
EXPECT
Use of uninitialized value $m1 in scalar assignment at - line 4.
Setting $/ to a reference to zero is forbidden at - line 4.
########
use warnings 'uninitialized';

my $x = "abc";
chomp $x; chop $x;
my $y;
chomp ($x, $y); chop ($x, $y);
EXPECT
Use of uninitialized value $y in chomp at - line 6.
Use of uninitialized value $y in chop at - line 6.
########
use warnings 'uninitialized';
my ($m1, @ma, %mh);
our ($g1);

delete $ma[$m1];
delete @ma[$m1, $g1];
delete $mh{$m1};
delete @mh{$m1, $g1};
EXPECT
Use of uninitialized value $m1 in delete at - line 5.
Use of uninitialized value $m1 in delete at - line 6.
Use of uninitialized value $g1 in delete at - line 6.
Use of uninitialized value $m1 in delete at - line 7.
Use of uninitialized value $m1 in delete at - line 8.
Use of uninitialized value $g1 in delete at - line 8.
########
use warnings 'uninitialized';
my ($m1, @ma, %mh);
our ($g1);

my @a = @ma[$m1, $g1];
@a = (4,5)[$m1, $g1];
@a = @mh{$m1, $g1};
EXPECT
Use of uninitialized value $m1 in array slice at - line 5.
Use of uninitialized value $g1 in array slice at - line 5.
Use of uninitialized value $m1 in list slice at - line 6.
Use of uninitialized value $g1 in list slice at - line 6.
Use of uninitialized value $m1 in hash slice at - line 7.
Use of uninitialized value $g1 in hash slice at - line 7.
########
use warnings 'uninitialized';
my ($m1, @ma, %mh, $v);
our ($g1, @ga, %gh);

$v = exists $ma[$m1];
$v = exists $ga[$g1];
$v = exists $mh{$m1};
$v = exists $gh{$g1};
EXPECT
Use of uninitialized value $m1 in exists at - line 5.
Use of uninitialized value $g1 in exists at - line 6.
Use of uninitialized value $m1 in exists at - line 7.
Use of uninitialized value $g1 in exists at - line 8.
########
use warnings 'uninitialized';
my ($m1, $m2);
my ($v, @a);
my ($t, $u) = (1, 1);

local $.;

@ma = (1   .. 2);
@ma = ($t  .. 2);
@ma = ($m1 .. 2);
@ma = (1   .. $u);
@ma = (1   .. $m2);

@ma = (1   ... 2);
@ma = ($t  ... 2);
@ma = ($m1 ... 2);
@ma = (1   ... $u);
@ma = (1   ... $m2);

$v = (1   .. 2);
$v = ($t  .. 2);
$v = ($m1 .. 2);
$v = (1   .. $u);
$v = (1   .. $m2);

$v = (1   ... 2);
$v = ($t  ... 2);
$v = ($m1 ... 2);
$v = (1   ... $u);
$v = (1   ... $m2);
EXPECT
Use of uninitialized value $m1 in range (or flop) at - line 10.
Use of uninitialized value $m2 in range (or flop) at - line 12.
Use of uninitialized value $m1 in range (or flop) at - line 16.
Use of uninitialized value $m2 in range (or flop) at - line 18.
Use of uninitialized value $. in range (or flip) at - line 20.
Use of uninitialized value $. in range (or flop) at - line 21.
Use of uninitialized value $. in range (or flip) at - line 23.
Use of uninitialized value $. in range (or flip) at - line 24.
Use of uninitialized value $. in range (or flip) at - line 26.
Use of uninitialized value $. in range (or flip) at - line 29.
Use of uninitialized value $. in range (or flip) at - line 30.
########
use warnings 'uninitialized';
my ($m1, $m2);
my ($v, @a);
my ($t, $u) = (1, 1);

@ma = ($t  .. $u);
@ma = ($m1 .. $u);
@ma = ($t  .. $m2);
@ma = ($m1 .. $m2);

@ma = ($t  ... $u);
@ma = ($m1 ... $u);
@ma = ($t  ... $m2);
@ma = ($m1 ... $m2);

$v = ($t  .. $u);
$v = ($m1 .. $u);
$v = ($t  .. $m2);
$v = ($m1 .. $m2);

$v = ($t  ... $u);
$v = ($m1 ... $u);
$v = ($t  ... $m2);
$v = ($m1 ... $m2);
EXPECT
Use of uninitialized value $m1 in range (or flop) at - line 7.
Use of uninitialized value $m2 in range (or flop) at - line 8.
Use of uninitialized value $m1 in range (or flop) at - line 9.
Use of uninitialized value $m2 in range (or flop) at - line 9.
Use of uninitialized value $m1 in range (or flop) at - line 12.
Use of uninitialized value $m2 in range (or flop) at - line 13.
Use of uninitialized value $m1 in range (or flop) at - line 14.
Use of uninitialized value $m2 in range (or flop) at - line 14.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

my ($x1,$x2);
$v = $x1 << $m1;
$v = $x2 << $g1;
EXPECT
Use of uninitialized value $m1 in left bitshift (<<) at - line 6.
Use of uninitialized value $x1 in left bitshift (<<) at - line 6.
Use of uninitialized value $g1 in left bitshift (<<) at - line 7.
Use of uninitialized value $x2 in left bitshift (<<) at - line 7.
########
use warnings 'uninitialized';
my ($m1, $m2, $v);
our ($g1, $g2);

use integer;
$v = $m1 + $g1;
$v = $m1 - $g1;
$v = $m1 * $g1;
eval {$v = $m1 / $g1};
$v = $m2 / 2;
eval {$v = $m1 % $g1};
$v = $m2 % 2;
$v = $m1 < $g1;
$v = $m1 > $g1;
$v = $m1 <= $g1;
$v = $m1 >= $g1;
$v = $m1 == $g1;
$v = $m1 != $g1;
$v = $m1 <=> $g1;
$v = -$m1;
EXPECT
Use of uninitialized value $g1 in integer addition (+) at - line 6.
Use of uninitialized value $m1 in integer addition (+) at - line 6.
Use of uninitialized value $g1 in integer subtraction (-) at - line 7.
Use of uninitialized value $m1 in integer subtraction (-) at - line 7.
Use of uninitialized value $g1 in integer multiplication (*) at - line 8.
Use of uninitialized value $m1 in integer multiplication (*) at - line 8.
Use of uninitialized value $g1 in integer division (/) at - line 9.
Use of uninitialized value $m2 in integer division (/) at - line 10.
Use of uninitialized value $g1 in integer modulus (%) at - line 11.
Use of uninitialized value $m1 in integer modulus (%) at - line 11.
Use of uninitialized value $m2 in integer modulus (%) at - line 12.
Use of uninitialized value $g1 in integer lt (<) at - line 13.
Use of uninitialized value $m1 in integer lt (<) at - line 13.
Use of uninitialized value $g1 in integer gt (>) at - line 14.
Use of uninitialized value $m1 in integer gt (>) at - line 14.
Use of uninitialized value $g1 in integer le (<=) at - line 15.
Use of uninitialized value $m1 in integer le (<=) at - line 15.
Use of uninitialized value $g1 in integer ge (>=) at - line 16.
Use of uninitialized value $m1 in integer ge (>=) at - line 16.
Use of uninitialized value $g1 in integer eq (==) at - line 17.
Use of uninitialized value $m1 in integer eq (==) at - line 17.
Use of uninitialized value $g1 in integer ne (!=) at - line 18.
Use of uninitialized value $m1 in integer ne (!=) at - line 18.
Use of uninitialized value $g1 in integer comparison (<=>) at - line 19.
Use of uninitialized value $m1 in integer comparison (<=>) at - line 19.
Use of uninitialized value $m1 in integer negation (-) at - line 20.
########
use warnings 'uninitialized';
my ($m1, $m2, $v);
our ($g1, $g2);

$v = int($g1);
$v = abs($g2);
EXPECT
Use of uninitialized value $g1 in int at - line 5.
Use of uninitialized value $g2 in abs at - line 6.
########
use warnings 'uninitialized';
my ($m1, $m2, $v);
our ($g1);

$v = pack $m1;
$v = pack "i*", $m2, $g1, $g2;
my @unpack = unpack $m1, $m2;
EXPECT
Use of uninitialized value $m1 in pack at - line 5.
Use of uninitialized value $m2 in pack at - line 6.
Use of uninitialized value $g1 in pack at - line 6.
Use of uninitialized value $g2 in pack at - line 6.
Use of uninitialized value $m1 in unpack at - line 7.
Use of uninitialized value $m2 in unpack at - line 7.
########
use warnings 'uninitialized';
my ($m1);
our ($g1);

my @sort;
@sort = sort $m1, $g1;
@sort = sort {$a <=> $b} $m1, $g1;
sub sortf {$a-1 <=> $b-1};
@sort = sort  &sortf, $m1, $g1;
@sort = sort { undef } 1, 2;
sub frobnicate($$) { undef }
@sort = sort frobnicate 1, 2;
@sort = sort pyfg 1, 2;
@sort = sort pyfgc 1, 2;
no warnings;
sub pyfg { undef }
sub pyfgc($$) { undef }
use warnings;
sub dog {}
sub dogwood($$) {}
@sort = sort dog     1,2;
@sort = sort dogwood 1,2;
EXPECT
Use of uninitialized value $m1 in sort at - line 6.
Use of uninitialized value $g1 in sort at - line 6.
Use of uninitialized value $m1 in sort at - line 6.
Use of uninitialized value $g1 in sort at - line 6.
Use of uninitialized value $m1 in sort at - line 7.
Use of uninitialized value $g1 in sort at - line 7.
Use of uninitialized value $g1 in sort at - line 7.
Use of uninitialized value $m1 in sort at - line 7.
Use of uninitialized value $a in subtraction (-) at - line 8.
Use of uninitialized value $b in subtraction (-) at - line 8.
Use of uninitialized value $m1 in sort at - line 9.
Use of uninitialized value $g1 in sort at - line 9.
Use of uninitialized value $m1 in sort at - line 9.
Use of uninitialized value $m1 in sort at - line 9.
Use of uninitialized value $g1 in sort at - line 9.
Use of uninitialized value $g1 in sort at - line 9.
Use of uninitialized value in sort at - line 10.
Use of uninitialized value in sort at - line 12.
Use of uninitialized value in sort at - line 13.
Use of uninitialized value in sort at - line 14.
Use of uninitialized value in sort at - line 21.
Use of uninitialized value in sort at - line 22.
########
use Config;
unless ($Config{d_double_has_inf} && $Config{d_double_has_nan}) {
    print <<EOM ;
SKIPPED
# No inf/nan support
EOM
    exit ;
}
my $nan = eval 'sin 9**9**9';
if ($nan == $nan) {
    print <<EOM ;
SKIPPED
# No nan support
EOM
    exit ;
}
use warnings 'uninitialized';
# The optimised {$a<=>$b} case should behave the same way as unoptimised.
@sort = sort { ($a)[0] <=> $b } 1, $nan;
@sort = sort {  $a     <=> $b } 1, $nan;
EXPECT
Use of uninitialized value in sort at - line 19.
Use of uninitialized value in sort at - line 20.
########
use warnings 'uninitialized';
my ($m1, $m2, $v);
our ($g1);

eval { $v = $m1 / $g1 };
$v = $m2 / 2;
eval { $v = $m1 % $g1 };
$v = $m2 % 2;
$v = $m1 == $g1;
$v = $m1 >= $g1;
$v = $m1 >  $g1;
$v = $m1 <= $g1;
$v = $m1 <  $g1;
$v = $m1 *  $g1;
$v = $m1 <=>$g1;
$v = $m1 != $g1;
$v = $m1   -$g1;
$v = $m1 ** $g1;
$v = $m1 +  $g1;
$v = $m1 -  $g1;
EXPECT
Use of uninitialized value $g1 in division (/) at - line 5.
Use of uninitialized value $m1 in division (/) at - line 5.
Use of uninitialized value $m2 in division (/) at - line 6.
Use of uninitialized value $g1 in modulus (%) at - line 7.
Use of uninitialized value $m1 in modulus (%) at - line 7.
Use of uninitialized value $m2 in modulus (%) at - line 8.
Use of uninitialized value $g1 in numeric eq (==) at - line 9.
Use of uninitialized value $m1 in numeric eq (==) at - line 9.
Use of uninitialized value $g1 in numeric ge (>=) at - line 10.
Use of uninitialized value $m1 in numeric ge (>=) at - line 10.
Use of uninitialized value $g1 in numeric gt (>) at - line 11.
Use of uninitialized value $m1 in numeric gt (>) at - line 11.
Use of uninitialized value $g1 in numeric le (<=) at - line 12.
Use of uninitialized value $m1 in numeric le (<=) at - line 12.
Use of uninitialized value $g1 in numeric lt (<) at - line 13.
Use of uninitialized value $m1 in numeric lt (<) at - line 13.
Use of uninitialized value $g1 in multiplication (*) at - line 14.
Use of uninitialized value $m1 in multiplication (*) at - line 14.
Use of uninitialized value $g1 in numeric comparison (<=>) at - line 15.
Use of uninitialized value $m1 in numeric comparison (<=>) at - line 15.
Use of uninitialized value $g1 in numeric ne (!=) at - line 16.
Use of uninitialized value $m1 in numeric ne (!=) at - line 16.
Use of uninitialized value $g1 in subtraction (-) at - line 17.
Use of uninitialized value $m1 in subtraction (-) at - line 17.
Use of uninitialized value $g1 in exponentiation (**) at - line 18.
Use of uninitialized value $m1 in exponentiation (**) at - line 18.
Use of uninitialized value $g1 in addition (+) at - line 19.
Use of uninitialized value $m1 in addition (+) at - line 19.
Use of uninitialized value $g1 in subtraction (-) at - line 20.
Use of uninitialized value $m1 in subtraction (-) at - line 20.
########
use warnings 'uninitialized';
sub TIESCALAR{bless[]}
sub FETCH { undef }

tie my $m1, "";
my $v;
$v = $m1 + $m1;
$v = $m1 - $m1;
no warnings;
$v = $m1 + $m1;
$v = $m1 - $m1;
EXPECT
Use of uninitialized value $m1 in addition (+) at - line 7.
Use of uninitialized value $m1 in addition (+) at - line 7.
Use of uninitialized value $m1 in subtraction (-) at - line 8.
Use of uninitialized value $m1 in subtraction (-) at - line 8.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = *global1{$m1};
$v = prototype $g1;
$v = bless [], $g1;
$v = `$m1`;

$v = $m1 . $g1;
EXPECT
Use of uninitialized value $m1 in glob elem at - line 5.
Use of uninitialized value $g1 in subroutine prototype at - line 6.
Use of uninitialized value $g1 in bless at - line 7.
Use of uninitialized value $m1 in quoted execution (``, qx) at - line 8.
Use of uninitialized value $m1 in concatenation (.) or string at - line 10.
Use of uninitialized value $g1 in concatenation (.) or string at - line 10.
########
use warnings 'uninitialized';
my ($m1);
our ($g1, $g2);

/y/;
/$m1/;
/$g1/;

s/y/z/;		undef $_;
s/$m1/z/;	undef $_;
s//$g1/;	undef $_;
s/$m1/$g1/;	undef $_;
tr/x/y/;	undef $_;
tr/x/y/r;	undef $_;

$g2 =~ /y/;
$g2 =~ /$m1/;
$g2 =~ /$g1/;
$g2 =~ s/y/z/;		undef $g2;
$g2 =~ s/$m1/z/;	undef $g2;
$g2 =~ s//$g1/;		undef $g2;
$g2 =~ s/$m1/$g1/;	undef $g2;
$g2 =~ tr/x/y/;		undef $g2; # XXX can't extract var name yet
$g2 =~ tr/x/y/r;	undef $g2; # XXX can't extract var name yet

my $foo = "abc";
$foo =~ /$m1/;
$foo =~ /$g1/;
$foo =~ s/y/z/;
$foo =~ s/$m1/z/;
$foo =~ s//$g1/;
$foo =~ s/$m1/$g1/;
$foo =~ s/./$m1/e;
undef $g1;
$m1 = '$g1';
$foo =~ s//$m1/ee;
undef $m1;
$m1 =~ tr/x/y/;		undef $m1;
$m1 =~ tr/x/y/r;
EXPECT
Use of uninitialized value $_ in pattern match (m//) at - line 5.
Use of uninitialized value $m1 in regexp compilation at - line 6.
Use of uninitialized value $_ in pattern match (m//) at - line 6.
Use of uninitialized value $g1 in regexp compilation at - line 7.
Use of uninitialized value $_ in pattern match (m//) at - line 7.
Use of uninitialized value $_ in substitution (s///) at - line 9.
Use of uninitialized value $m1 in regexp compilation at - line 10.
Use of uninitialized value $_ in substitution (s///) at - line 10.
Use of uninitialized value $_ in substitution (s///) at - line 10.
Use of uninitialized value $_ in substitution (s///) at - line 11.
Use of uninitialized value $_ in substitution (s///) at - line 11.
Use of uninitialized value $g1 in substitution iterator at - line 11.
Use of uninitialized value $m1 in regexp compilation at - line 12.
Use of uninitialized value $_ in substitution (s///) at - line 12.
Use of uninitialized value $_ in substitution (s///) at - line 12.
Use of uninitialized value $g1 in substitution iterator at - line 12.
Use of uninitialized value $_ in transliteration (tr///) at - line 13.
Use of uninitialized value $_ in transliteration (tr///) at - line 14.
Use of uninitialized value $g2 in pattern match (m//) at - line 16.
Use of uninitialized value $m1 in regexp compilation at - line 17.
Use of uninitialized value $g2 in pattern match (m//) at - line 17.
Use of uninitialized value $g1 in regexp compilation at - line 18.
Use of uninitialized value $g2 in pattern match (m//) at - line 18.
Use of uninitialized value $g2 in substitution (s///) at - line 19.
Use of uninitialized value $m1 in regexp compilation at - line 20.
Use of uninitialized value $g2 in substitution (s///) at - line 20.
Use of uninitialized value $g2 in substitution (s///) at - line 20.
Use of uninitialized value $g2 in substitution (s///) at - line 21.
Use of uninitialized value $g2 in substitution (s///) at - line 21.
Use of uninitialized value $g1 in substitution iterator at - line 21.
Use of uninitialized value $m1 in regexp compilation at - line 22.
Use of uninitialized value $g2 in substitution (s///) at - line 22.
Use of uninitialized value $g2 in substitution (s///) at - line 22.
Use of uninitialized value $g1 in substitution iterator at - line 22.
Use of uninitialized value in transliteration (tr///) at - line 23.
Use of uninitialized value in transliteration (tr///) at - line 24.
Use of uninitialized value $m1 in regexp compilation at - line 27.
Use of uninitialized value $g1 in regexp compilation at - line 28.
Use of uninitialized value $m1 in regexp compilation at - line 30.
Use of uninitialized value $g1 in substitution iterator at - line 31.
Use of uninitialized value $m1 in regexp compilation at - line 32.
Use of uninitialized value $g1 in substitution iterator at - line 32.
Use of uninitialized value $m1 in substitution (s///) at - line 33.
Use of uninitialized value in substitution iterator at - line 36.
Use of uninitialized value $m1 in transliteration (tr///) at - line 38.
Use of uninitialized value $m1 in transliteration (tr///) at - line 39.
########
use warnings 'uninitialized';
my ($m1);

{ my $foo = "abc"; (substr($foo,0,0)) = ($m1) }
EXPECT
Use of uninitialized value $m1 in list assignment at - line 4.
########
use warnings 'uninitialized';
our ($g1);

study;
study $g1;
EXPECT
Use of uninitialized value $_ in study at - line 4.
Use of uninitialized value $g1 in study at - line 5.
########
use warnings 'uninitialized';
my ($m1);

pos()=0;
pos($m1)=0;
EXPECT
Use of uninitialized value $_ in scalar assignment at - line 4.
Use of uninitialized value $m1 in scalar assignment at - line 5.
########
use warnings 'uninitialized';
my ($m1);
our ($g1);

$v = pos($m1) + 1;
$v = pos($g1) + 1;
$m1 = 0;
$g1 = "";
$v = pos($m1) + 1;
$v = pos($g1) + 1;
EXPECT
Use of uninitialized value in addition (+) at - line 5.
Use of uninitialized value in addition (+) at - line 6.
Use of uninitialized value in addition (+) at - line 9.
Use of uninitialized value in addition (+) at - line 10.
########
use warnings 'uninitialized';
my ($m1);

{ my $x = "a" x $m1 }		# NB LHS of repeat does not warn
{ my @x = ("a") x $m1 }
EXPECT
Use of uninitialized value $m1 in repeat (x) at - line 4.
Use of uninitialized value $m1 in repeat (x) at - line 5.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = "$m1";

$v = $m1 lt $g1;
$v = $m1 le $g1;
$v = $m1 gt $g1;
$v = $m1 ge $g1;
$v = $m1 eq $g1;
$v = $m1 ne $g1;
$v = $m1 cmp $g1;
EXPECT
Use of uninitialized value $m1 in string at - line 5.
Use of uninitialized value $m1 in string lt at - line 7.
Use of uninitialized value $g1 in string lt at - line 7.
Use of uninitialized value $m1 in string le at - line 8.
Use of uninitialized value $g1 in string le at - line 8.
Use of uninitialized value $m1 in string gt at - line 9.
Use of uninitialized value $g1 in string gt at - line 9.
Use of uninitialized value $m1 in string ge at - line 10.
Use of uninitialized value $g1 in string ge at - line 10.
Use of uninitialized value $m1 in string eq at - line 11.
Use of uninitialized value $g1 in string eq at - line 11.
Use of uninitialized value $m1 in string ne at - line 12.
Use of uninitialized value $g1 in string ne at - line 12.
Use of uninitialized value $m1 in string comparison (cmp) at - line 13.
Use of uninitialized value $g1 in string comparison (cmp) at - line 13.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = atan2($m1,$g1);
$v = sin $m1;
$v = cos $m1;
$v = rand $m1;
$v = srand $m1;
$v = exp $m1;
$v = eval {log $m1};
$v = sqrt $m1;
$v = hex $m1;
$v = oct $m1;
$v = oct;
$v = length; # does not warn
EXPECT
Use of uninitialized value $g1 in atan2 at - line 5.
Use of uninitialized value $m1 in atan2 at - line 5.
Use of uninitialized value $m1 in sin at - line 6.
Use of uninitialized value $m1 in cos at - line 7.
Use of uninitialized value $m1 in rand at - line 8.
Use of uninitialized value $m1 in srand at - line 9.
Use of uninitialized value $m1 in exp at - line 10.
Use of uninitialized value $m1 in log at - line 11.
Use of uninitialized value $m1 in sqrt at - line 12.
Use of uninitialized value $m1 in hex at - line 13.
Use of uninitialized value $m1 in oct at - line 14.
Use of uninitialized value $_ in oct at - line 15.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = substr $m1, $g1;
$v = substr $m1, $g1, $m2;
$v = substr $m1, $g1, $m2, $g2;	undef $m1;
substr($m1, $g1) = $g2;		undef $m1; # NB global2
substr($m1, $g1, $m2) = $g2;	undef $m1; # isn't identified

$v = eval {vec ($m1, $g1, $m2)};
eval {vec ($m1, $g1, $m2) = $g2};	undef $m1; # ditto

$v = index  $m1, $m2;
$v = index  $m1, $m2, $g1;
$v = rindex $m1, $m2;
$v = rindex $m1, $m2, $g1;
EXPECT
Use of uninitialized value $g1 in substr at - line 5.
Use of uninitialized value $m1 in substr at - line 5.
Use of uninitialized value $m2 in substr at - line 6.
Use of uninitialized value $g1 in substr at - line 6.
Use of uninitialized value $m1 in substr at - line 6.
Use of uninitialized value $m2 in substr at - line 7.
Use of uninitialized value $g1 in substr at - line 7.
Use of uninitialized value $g2 in substr at - line 7.
Use of uninitialized value $m1 in substr at - line 7.
Use of uninitialized value $g1 in substr at - line 8.
Use of uninitialized value $g2 in substr at - line 8.
Use of uninitialized value $m1 in substr at - line 8.
Use of uninitialized value $m2 in substr at - line 9.
Use of uninitialized value $g1 in substr at - line 9.
Use of uninitialized value $g2 in substr at - line 9.
Use of uninitialized value $m1 in substr at - line 9.
Use of uninitialized value $m2 in vec at - line 11.
Use of uninitialized value $g1 in vec at - line 11.
Use of uninitialized value $m1 in vec at - line 11.
Use of uninitialized value $m2 in vec at - line 12.
Use of uninitialized value $g1 in vec at - line 12.
Use of uninitialized value $m1 in index at - line 14.
Use of uninitialized value $m2 in index at - line 14.
Use of uninitialized value $g1 in index at - line 15.
Use of uninitialized value $m1 in index at - line 15.
Use of uninitialized value $m2 in index at - line 15.
Use of uninitialized value $m1 in rindex at - line 16.
Use of uninitialized value $m2 in rindex at - line 16.
Use of uninitialized value $g1 in rindex at - line 17.
Use of uninitialized value $m1 in rindex at - line 17.
Use of uninitialized value $m2 in rindex at - line 17.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = sprintf $m1;
$v = sprintf '%d%d%d%d', $m1, $m2, $g1, $g2;
my $m3; eval {formline $m3 };
formline '@<<@<<@<<@<<', $m1, $m2, $g1, $g2;
EXPECT
Use of uninitialized value $m1 in sprintf at - line 5.
Use of uninitialized value $m1 in sprintf at - line 6.
Use of uninitialized value $m2 in sprintf at - line 6.
Use of uninitialized value $g1 in sprintf at - line 6.
Use of uninitialized value $g2 in sprintf at - line 6.
Use of uninitialized value $m3 in formline at - line 7.
Use of uninitialized value $m1 in formline at - line 8.
Use of uninitialized value $m2 in formline at - line 8.
Use of uninitialized value $g1 in formline at - line 8.
Use of uninitialized value $g2 in formline at - line 8.
########
# SKIP ? !$Config{d_crypt}
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = crypt $m1, $g1;

$v = ord;
$v = ord $m1;
$v = chr;
$v = chr $m1;

$v = ucfirst;
$v = ucfirst $m1;
$v = lcfirst;
$v = lcfirst $m1;
$v = uc;
$v = uc $m1;
$v = lc;
$v = lc $m1;

$v = quotemeta;
$v = quotemeta $m1;
EXPECT
Use of uninitialized value $m1 in crypt at - line 5.
Use of uninitialized value $g1 in crypt at - line 5.
Use of uninitialized value $_ in ord at - line 7.
Use of uninitialized value $m1 in ord at - line 8.
Use of uninitialized value $_ in chr at - line 9.
Use of uninitialized value $m1 in chr at - line 10.
Use of uninitialized value $_ in ucfirst at - line 12.
Use of uninitialized value $m1 in ucfirst at - line 13.
Use of uninitialized value $_ in lcfirst at - line 14.
Use of uninitialized value $m1 in lcfirst at - line 15.
Use of uninitialized value $_ in uc at - line 16.
Use of uninitialized value $m1 in uc at - line 17.
Use of uninitialized value $_ in lc at - line 18.
Use of uninitialized value $m1 in lc at - line 19.
Use of uninitialized value $_ in quotemeta at - line 21.
Use of uninitialized value $m1 in quotemeta at - line 22.
########
use warnings 'uninitialized';
my ($m1, $v1, $v2, $v3, $v4);
our ($g1);

($v1,$v2,$v3,$v4) = split;
($v1,$v2,$v3,$v4) = split $m1;
($v1,$v2,$v3,$v4) = split $m1, $m2;
($v1,$v2,$v3,$v4) = split $m1, $m2, $g1;

$v1 = join $m1;
$v2 = join $m1, $m2;
$v3 = join $m1, $m2, $m3;
EXPECT
Use of uninitialized value $_ in split at - line 5.
Use of uninitialized value $m1 in regexp compilation at - line 6.
Use of uninitialized value $_ in split at - line 6.
Use of uninitialized value $m1 in regexp compilation at - line 7.
Use of uninitialized value $m2 in split at - line 7.
Use of uninitialized value $m1 in regexp compilation at - line 8.
Use of uninitialized value $g1 in split at - line 8.
Use of uninitialized value $m2 in split at - line 8.
Use of uninitialized value $m1 in join or string at - line 10.
Use of uninitialized value $m2 in join or string at - line 11.
Use of uninitialized value $m1 in join or string at - line 12.
Use of uninitialized value $m2 in join or string at - line 12.
Use of uninitialized value $m3 in join or string at - line 12.
########
use warnings 'uninitialized';
my ($m1, $m2, @ma, $v);

our @foo1=(1,undef); chomp @foo1;
my  @foo2=(1,undef); chomp @foo2;
our @foo3=(1,undef); chop  @foo3;
my  @foo4=(1,undef); chop  @foo4;
our @foo5=(1,undef); $v = sprintf "%s%s",@foo5;
my  @foo6=(1,undef); $v = sprintf "%s%s",@foo6;
our %foo7=('foo'=>'bar','baz'=>undef); $v = sprintf "%s%s%s%s",%foo7;
my  %foo8=('foo'=>'bar','baz'=>undef); $v = sprintf "%s%s%s%s",%foo8;
our @foo9 =(1,undef); $v = sprintf "%s%s%s%s",$m1,@foo9, $ma[2];
my  @foo10=(1,undef); $v = sprintf "%s%s%s%s",$m2,@foo10,$ma[2];
our %foo11=('foo'=>'bar','baz'=>undef); $v = join '', %foo11;
my  %foo12=('foo'=>'bar','baz'=>undef); $v = join '', %foo12;
our %foo13=(1..2000,'foo'=>'bar','baz'=>undef); $v = join '', %foo13;
my  %foo14=(1..2000,'foo'=>'bar','baz'=>undef); $v = join '', %foo14;
EXPECT
Use of uninitialized value $foo1[1] in chomp at - line 4.
Use of uninitialized value $foo2[1] in chomp at - line 5.
Use of uninitialized value $foo3[1] in chop at - line 6.
Use of uninitialized value $foo4[1] in chop at - line 7.
Use of uninitialized value $foo5[1] in sprintf at - line 8.
Use of uninitialized value $foo6[1] in sprintf at - line 9.
Use of uninitialized value $foo7{"baz"} in sprintf at - line 10.
Use of uninitialized value $foo8{"baz"} in sprintf at - line 11.
Use of uninitialized value $m1 in sprintf at - line 12.
Use of uninitialized value $foo9[1] in sprintf at - line 12.
Use of uninitialized value in sprintf at - line 12.
Use of uninitialized value $m2 in sprintf at - line 13.
Use of uninitialized value $foo10[1] in sprintf at - line 13.
Use of uninitialized value in sprintf at - line 13.
Use of uninitialized value $foo11{"baz"} in join or string at - line 14.
Use of uninitialized value $foo12{"baz"} in join or string at - line 15.
Use of uninitialized value within %foo13 in join or string at - line 16.
Use of uninitialized value within %foo14 in join or string at - line 17.
########
use warnings 'uninitialized';
my ($v);

undef $^A; $v = $^A + ${^FOO}; # should output '^A' not chr(1)
*GLOB1 = *GLOB2;
$v = $GLOB1 + 1;
$v = $GLOB2 + 1;
EXPECT
Use of uninitialized value $^FOO in addition (+) at - line 4.
Use of uninitialized value $^A in addition (+) at - line 4.
Use of uninitialized value $GLOB1 in addition (+) at - line 6.
Use of uninitialized value $GLOB2 in addition (+) at - line 7.
########
use warnings 'uninitialized';
my ($v);

# check hash key is sanitised
my %h = ("\0011\002\r\n\t\f\"\\\x{1234}abcdefghijklmnopqrstuvwxyz", undef);
$v = join '', %h;
EXPECT
Use of uninitialized value $h{"\0011\2\r\n\t\f\"\\\x{1234}abcde"...} in join or string at - line 6.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = eval { \&$m1 };
$v = eval { \&$g1 };

my @a;
@a = splice @a, $m1, $g1;
$v = 1 + splice @a, $m1, $g1;

my $x = bless [], 'Z';
eval { $x->$m1() };

eval { &$m1() };
eval { &$g1() };

warn $m1,$g1,"foo";

eval { die $m1, $g1 };

reset $m1;
reset $g1;
EXPECT
Use of uninitialized value $m1 in subroutine dereference at - line 5.
Use of uninitialized value $g1 in subroutine dereference at - line 6.
Use of uninitialized value $m1 in splice at - line 9.
Use of uninitialized value $g1 in splice at - line 9.
Use of uninitialized value $m1 in splice at - line 10.
Use of uninitialized value $g1 in splice at - line 10.
Use of uninitialized value in addition (+) at - line 10.
Use of uninitialized value $m1 in method lookup at - line 13.
Use of uninitialized value $m1 in warn at - line 18.
Use of uninitialized value $g1 in warn at - line 18.
foo at - line 18.
Use of uninitialized value $m1 in die at - line 20.
Use of uninitialized value $g1 in die at - line 20.
Use of uninitialized value $m1 in symbol reset at - line 22.
Use of uninitialized value $g1 in symbol reset at - line 23.
########
use warnings 'uninitialized';
my ($m1);
our ($g1);

open FOO;		# accesses $FOO
my $foo = 'FO';
open($foo."O");	# accesses $FOO
open my $x;		# accesses ${*$x}
open $foobar;	# accesses ${*$foobar}
my $y;
open $y, $m1;
eval { open $y, $m1, $g1 };
open $y, '<', $g1;

sysopen $y, $m1, $m2;
sysopen $y, $m1, $g1, $m2;

my $old = umask;
umask $m1;
umask $g1;
umask $old;

binmode STDIN, $m1;
EXPECT
Use of uninitialized value $FOO in open at - line 5.
Use of uninitialized value in open at - line 7.
Use of uninitialized value in open at - line 8.
Use of uninitialized value in open at - line 9.
Use of uninitialized value $m1 in open at - line 11.
Use of uninitialized value $m1 in open at - line 12.
Use of uninitialized value $g1 in open at - line 13.
Use of uninitialized value $m2 in sysopen at - line 15.
Use of uninitialized value $m1 in sysopen at - line 15.
Use of uninitialized value $m2 in sysopen at - line 16.
Use of uninitialized value $g1 in sysopen at - line 16.
Use of uninitialized value $m1 in sysopen at - line 16.
Use of uninitialized value $m1 in umask at - line 19.
Use of uninitialized value $g1 in umask at - line 20.
Use of uninitialized value $m1 in binmode at - line 23.
########
use warnings 'uninitialized';
my ($m1);
our ($g1);

eval { my $x; tie $x, $m1 };

eval { my $x; read    $m1, $x, $g1 };
eval { my $x; read    $m1, $x, $g1, $g2 };
eval { my $x; sysread $m1, $x, $g1 };
eval { my $x; sysread $m1, $x, $g1, $g2 };
EXPECT
Use of uninitialized value $m1 in tie at - line 5.
Use of uninitialized value $m1 in ref-to-glob cast at - line 7.
Use of uninitialized value $g1 in read at - line 7.
Use of uninitialized value $m1 in ref-to-glob cast at - line 8.
Use of uninitialized value $g1 in read at - line 8.
Use of uninitialized value $g2 in read at - line 8.
Use of uninitialized value $m1 in ref-to-glob cast at - line 9.
Use of uninitialized value $g1 in sysread at - line 9.
Use of uninitialized value $m1 in ref-to-glob cast at - line 10.
Use of uninitialized value $g1 in sysread at - line 10.
Use of uninitialized value $g2 in sysread at - line 10.
########
use warnings 'uninitialized';
my ($m1);
our ($g1, @ga);

printf $m1;
printf STDERR "%d%d%d%d\n", $m1, $m2, $g1, $g2;
printf $ga[1000];
printf STDERR "FOO1:%s\n", $ga[1000];
printf STDERR "FOO2:%s%s%s%s\n", $m1, $g1, $ga[1],$m2;
printf STDERR "FOO3:%s%s%s\n", "X", $ga[1],"Y";
EXPECT
Use of uninitialized value $m1 in printf at - line 5.
Use of uninitialized value $m1 in printf at - line 6.
Use of uninitialized value $m2 in printf at - line 6.
Use of uninitialized value $g1 in printf at - line 6.
Use of uninitialized value $g2 in printf at - line 6.
0000
Use of uninitialized value in printf at - line 7.
Use of uninitialized value in printf at - line 8.
FOO1:
Use of uninitialized value $m1 in printf at - line 9.
Use of uninitialized value $g1 in printf at - line 9.
Use of uninitialized value in printf at - line 9.
Use of uninitialized value $m2 in printf at - line 9.
FOO2:
Use of uninitialized value in printf at - line 10.
FOO3:XY
########
use warnings 'uninitialized';
my ($m1);
our ($g1);

eval { my $x; seek    $x,$m1, $g1 };
eval { my $x; sysseek $x,$m1, $g1 };
eval { syswrite $m1, $g1 }; # logic changed - now won't try $g1 if $m1 is bad
# eval { syswrite STDERR, $m1 };        # XXX under utf8, can give
# eval { syswrite STDERR, $m1, $g1 };   # XXX different warnings
# eval { syswrite STDERR, $m1, $g1, $m2 };
eval { my $x; socket $x, $m1, $g1, $m2 };
eval { my ($x,$y); socketpair $x, $y, $m1, $g1, $m2 };
EXPECT
Use of uninitialized value $x in ref-to-glob cast at - line 5.
Use of uninitialized value $g1 in seek at - line 5.
Use of uninitialized value $m1 in seek at - line 5.
Use of uninitialized value $x in ref-to-glob cast at - line 6.
Use of uninitialized value $g1 in sysseek at - line 6.
Use of uninitialized value $m1 in sysseek at - line 6.
Use of uninitialized value $m1 in ref-to-glob cast at - line 7.
Use of uninitialized value $m2 in socket at - line 11.
Use of uninitialized value $g1 in socket at - line 11.
Use of uninitialized value $m1 in socket at - line 11.
Use of uninitialized value $m2 in socketpair at - line 12.
Use of uninitialized value $g1 in socketpair at - line 12.
Use of uninitialized value $m1 in socketpair at - line 12.
########
use Config; 
BEGIN { 
  if ( !$Config{d_flock} &&
       !$Config{d_fcntl_can_lock} &&
       !$Config{d_lockf} ) {
    print <<EOM ;
SKIPPED
# flock not present
EOM
    exit ;
  } 
}
use warnings 'uninitialized';
our ($g1);

eval { my $x; flock $x, $g1 };
EXPECT
Use of uninitialized value $x in ref-to-glob cast at - line 16.
Use of uninitialized value $g1 in flock at - line 16.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

stat;
lstat;
stat $m1;
lstat $g1;

$v = -R $m1;
$v = -W $m1;
$v = -X $m1;
$v = -r $m1;
$v = -w $m1;
$v = -x $m1;
$v = -e $m1;
$v = -o $m1;
$v = -O $m1;
$v = -z $m1;
$v = -s $m1;
$v = -M $m1;
$v = -A $m1;
$v = -C $m1;
$v = -S $m1;
$v = -c $m1;
$v = -b $m1;
$v = -f $m1;
$v = -d $m1;
$v = -p $m1;
$v = -l $m1;
$v = -u $m1;
$v = -g $m1;
# $v = -k $m1; # XXX this is a no-op under win32
$v = -t $m1;
$v = -T $m1;
$v = -B $m1;
EXPECT
Use of uninitialized value $_ in stat at - line 5.
Use of uninitialized value $_ in lstat at - line 6.
Use of uninitialized value $m1 in stat at - line 7.
Use of uninitialized value $g1 in lstat at - line 8.
Use of uninitialized value $m1 in -R at - line 10.
Use of uninitialized value $m1 in -W at - line 11.
Use of uninitialized value $m1 in -X at - line 12.
Use of uninitialized value $m1 in -r at - line 13.
Use of uninitialized value $m1 in -w at - line 14.
Use of uninitialized value $m1 in -x at - line 15.
Use of uninitialized value $m1 in -e at - line 16.
Use of uninitialized value $m1 in -o at - line 17.
Use of uninitialized value $m1 in -O at - line 18.
Use of uninitialized value $m1 in -z at - line 19.
Use of uninitialized value $m1 in -s at - line 20.
Use of uninitialized value $m1 in -M at - line 21.
Use of uninitialized value $m1 in -A at - line 22.
Use of uninitialized value $m1 in -C at - line 23.
Use of uninitialized value $m1 in -S at - line 24.
Use of uninitialized value $m1 in -c at - line 25.
Use of uninitialized value $m1 in -b at - line 26.
Use of uninitialized value $m1 in -f at - line 27.
Use of uninitialized value $m1 in -d at - line 28.
Use of uninitialized value $m1 in -p at - line 29.
Use of uninitialized value $m1 in -l at - line 30.
Use of uninitialized value $m1 in -u at - line 31.
Use of uninitialized value $m1 in -g at - line 32.
Use of uninitialized value $m1 in -t at - line 34.
Use of uninitialized value $m1 in -T at - line 35.
Use of uninitialized value $m1 in -B at - line 36.
########
use warnings 'uninitialized';
my ($m1, $v);
our ($g1);

$v = localtime $m1;
$v = gmtime $g1;
EXPECT
Use of uninitialized value $m1 in localtime at - line 5.
Use of uninitialized value $g1 in gmtime at - line 6.
########
use warnings 'uninitialized';
my ($m1, $m2, $v);

$v = eval;
$v = eval $m1;
$m2 = q($m1); $v = 1 + eval $m2;
EXPECT
Use of uninitialized value $_ in eval "string" at - line 4.
Use of uninitialized value $m1 in eval "string" at - line 5.
Use of uninitialized value in addition (+) at - line 6.
########
use warnings 'uninitialized';
my ($m1);

exit $m1;
EXPECT
Use of uninitialized value $m1 in exit at - line 4.
########
use warnings 'uninitialized';
my $undef;

if ($undef == 3) {
} elsif ($undef == 0) {
}
EXPECT
Use of uninitialized value $undef in numeric eq (==) at - line 4.
Use of uninitialized value $undef in numeric eq (==) at - line 5.
########
# TODO long standing bug - conditions of while loops
use warnings;

my $c;
my $d = 1;
while ($c == 0 && $d) {
  # a
  # few
  # blank
  # lines
  undef $d;
}
EXPECT
Use of uninitialized value $c in numeric eq (==) at - line 5.
Use of uninitialized value $c in numeric eq (==) at - line 5.
########
# TODO long standing bug - conditions of until loops
use warnings;

my $c;
my $d;
until ($c == 1) {
  # a
  # few
  # blank
  # lines
  $c = 1 if ++$d == 2;
}
EXPECT
Use of uninitialized value $c in numeric eq (==) at - line 5.
Use of uninitialized value $c in numeric eq (==) at - line 5.
########
# TODO long standing bug - conditions of for loops
use warnings;

my $c;
my $d;
for ($d = 1; $c == 0 && $d; ) {
  # a
  # few
  # blank
  # lines
  undef $d;
}

my $e;
for ($d = 2; $d > 0; $e = !($c == 0)) {
  # a
  # few
  # blank
  # lines
  --$d;
}
EXPECT
Use of uninitialized value $c in numeric eq (==) at - line 5.
Use of uninitialized value $c in numeric eq (==) at - line 5.
Use of uninitialized value $c in numeric eq (==) at - line 14.
Use of uninitialized value $c in numeric eq (==) at - line 14.
########
# TODO long standing bug - more general variant of the above problem
use warnings;
my $undef;

my $a = $undef + 1;
my $b
  = $undef
  + 1;
EXPECT
Use of uninitialized value $undef in addition (+) at - line 4.
Use of uninitialized value $undef in addition (+) at - line 7.
########
use warnings 'uninitialized';
my ($r1, $r2);
$_ = undef;
$v = reverse;
$v = reverse $r1;
$v = reverse "abc", $r2, "def";
EXPECT
Use of uninitialized value in reverse at - line 4.
Use of uninitialized value $r1 in reverse at - line 5.
Use of uninitialized value $r2 in reverse at - line 6.
########
use warnings 'uninitialized';
#
# ops that can return undef for defined args
# split into separate tests to diagnose the cause of daily build smoke
#
# *** `` not tested: Windows produces an error on STDERR
# *** ditto qx()
# *** pipe() not tested
# *** ioctl not tested
# *** socket not tested
# *** socketpair not tested
# *** bind not tested
# *** connect not tested
# *** listen not tested
# *** shutdown not tested
# *** setsockopt not tested
# *** getpeername not tested
# *** readdir not tested
# *** telldir not tested
# *** seekdir not tested
# *** rewinddir not tested
# *** closedir not tested
# *** gmtime not tested
# *** alarm not tested
# *** semget not tested
# *** getlogin not tested
EXPECT
########
use warnings 'uninitialized';
if ($^O eq 'MSWin32') {
    print <<'EOM';
SKIPPED
# `` produces an error on STDERR on Win32
EOM
    exit;
} 
my $nocmd  = '/no/such/command';
my $v;
$v = 1 + `$nocmd`;
EXPECT
Use of uninitialized value in addition (+) at - line 11.
########
use warnings 'uninitialized';
if ($^O eq 'MSWin32') {
    print <<'EOM';
SKIPPED
# qx produces an error on STDERR on Win32
EOM
    exit;
} 
my $nocmd  = '/no/such/command';
my $v;
$v = 1 + qx($nocmd);
EXPECT
Use of uninitialized value in addition (+) at - line 11.
########
use warnings 'uninitialized';
my $nan = "NaN";
if ($nan == $nan) {
    print <<'EOM';
SKIPPED
# NaN not supported here.
EOM
    exit;
} 
my $v;
$v = 1 + ($nan <=> 1);
EXPECT
Use of uninitialized value in addition (+) at - line 11.
########
use warnings 'uninitialized';
if ($^O eq 'MSWin32') {
    print <<'EOM';
SKIPPED
# -k produces no warning on Win32
EOM
    exit;
} 
my $nofile = '/no/such/file';
my $v;
$v = 1 + -k $nofile;
EXPECT
Use of uninitialized value in addition (+) at - line 11.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
my $f = "";
$v = 1 + open($f, $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 5.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + fileno($nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + binmode($nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + tied($nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + getc($nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + sysread($nofile, my $buf,1);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + readline($nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + eval { send($nofile, $buf,0) };
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
my $fh = "";
$v = 1 + eval { accept($fh, $nofile) };
EXPECT
Use of uninitialized value in addition (+) at - line 5.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-r $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-w $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-x $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-o $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-R $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-W $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-X $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-O $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-e $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-z $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-s $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-f $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-d $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-l $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-p $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-S $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-b $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-c $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-t $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-u $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-g $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-T $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-B $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-M $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-A $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + (-C $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + eval { readlink $nofile };
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + opendir($f, $nofile);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + undef;
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
my $x = 1; $v = 1 + undef($x);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $emptys = "";
$v = 1 + substr($emptys,2,1);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my @emptya;
$v = 1 + each @emptya;
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my %emptyh;
$v = 1 + each %emptyh;
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my @emptya;
$v = 1 + sort @emptya;
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $zero = 0; $v = 1 + caller($zero);
EXPECT
Use of uninitialized value in addition (+) at - line 3.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
$v = 1 + do $nofile;
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $fn = sub {};
$v = 1 + prototype $fn;
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized'; no warnings 'deprecated';
my $v;
my $fn = sub {};
$v = 1 + (1 ~~ $fn);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $f = "";
$v = 1 + (print STDIN $f); # print to STDIN returns undef
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $f = "";
$v = 1 + (printf STDIN "%s", $f);
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $f = "";
{ use feature 'say'; $v = 1 + (say STDIN "%s", $f); }
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $v;
my $f = "";
$v = 1 + (unpack("",$f));
EXPECT
Use of uninitialized value in addition (+) at - line 4.
########
use warnings 'uninitialized';
my $nofile = '/no/such/file';
my $v;
my $f = "";
$v = 1 + sysopen($f, $nofile, 0);
EXPECT
Use of uninitialized value in addition (+) at - line 5.
########
use warnings 'uninitialized';
my $v;
{ my $x = -1; $v = 1 + sysseek(DATA, $x, 0); }
__END__
EXPECT
Use of uninitialized value in addition (+) at - line 3.
########
use warnings 'uninitialized';
delete $::{'Foo::'};
my $moo = $Foo::BAR + 42;
__END__
EXPECT
Use of uninitialized value in addition (+) at - line 3.
########
use warnings 'uninitialized';
use constant {u=>undef, v=>undef};
sub foo () {u}
sub foo () {v}
EXPECT
########
# [perl #72090]
use warnings 'uninitialized';
$a = @$a > 0;
EXPECT
Use of uninitialized value $a in array dereference at - line 3.
Use of uninitialized value in numeric gt (>) at - line 3.
########
# [perl #103766]
use warnings 'uninitialized';
"@{[ $x ]}";
EXPECT
Use of uninitialized value in join or string at - line 3.
########
# inside formats
use warnings 'uninitialized';
my $x;
format =
@
"$x";
.
write;
EXPECT
Use of uninitialized value $x in string at - line 6.
########
# NAME off-by-one error in hash bucket walk in key detection logic
use warnings 'uninitialized';

for ( 0 .. 20 ) { # we assume that this means we test keys for every bucket
    my %h= ( $_ => undef );
    my $s= sprintf "%s", $h{$_};
}
EXPECT
Use of uninitialized value $h{"0"} in sprintf at - line 5.
Use of uninitialized value $h{"1"} in sprintf at - line 5.
Use of uninitialized value $h{"2"} in sprintf at - line 5.
Use of uninitialized value $h{"3"} in sprintf at - line 5.
Use of uninitialized value $h{"4"} in sprintf at - line 5.
Use of uninitialized value $h{"5"} in sprintf at - line 5.
Use of uninitialized value $h{"6"} in sprintf at - line 5.
Use of uninitialized value $h{"7"} in sprintf at - line 5.
Use of uninitialized value $h{"8"} in sprintf at - line 5.
Use of uninitialized value $h{"9"} in sprintf at - line 5.
Use of uninitialized value $h{"10"} in sprintf at - line 5.
Use of uninitialized value $h{"11"} in sprintf at - line 5.
Use of uninitialized value $h{"12"} in sprintf at - line 5.
Use of uninitialized value $h{"13"} in sprintf at - line 5.
Use of uninitialized value $h{"14"} in sprintf at - line 5.
Use of uninitialized value $h{"15"} in sprintf at - line 5.
Use of uninitialized value $h{"16"} in sprintf at - line 5.
Use of uninitialized value $h{"17"} in sprintf at - line 5.
Use of uninitialized value $h{"18"} in sprintf at - line 5.
Use of uninitialized value $h{"19"} in sprintf at - line 5.
Use of uninitialized value $h{"20"} in sprintf at - line 5.
########
# NAME SvPOK && SvLEN==0 should not produce uninit warning
use warnings 'uninitialized';

$v = int(${qr||}); # sv_2iv on a regexp
$v = 1.1 *  ${qr||}; # sv_2nv on a regexp
$v = ${qr||} << 2; # sv_2uv on a regexp

sub TIESCALAR{bless[]}
sub FETCH {${qr||}}
tie $t, "";
$v = 1.1 * $t; # sv_2nv on a tied regexp

EXPECT
########
# multi-level uninitialised array/hash indexes
use warnings 'uninitialized';

our ($i0, $i2, $i4, $i6, $i8, $i10, $i12);
my  ($i1, $i3, $i5, $i7, $i9, $i11, $i13);

my (@a,%h);
my $v;


# use enough depth that OP_MULTIDEREF needs more than one action word

$v = $a[$i0]{$i1}[$i2]{$i3}[$i4]{$i5}[$i6]{$i7}[$i8]{$i9}[$i10]{$i11}[$i12]{$i13};
$v = $h{$i0}[$i1]{$i2}[$i3]{$i4}[$i5]{$i6}[$i7]{$i8}[$i9]{$i10}[$i11]{$i12}[$i13];

EXPECT
Use of uninitialized value $i0 in array element at - line 13.
Use of uninitialized value $i1 in hash element at - line 13.
Use of uninitialized value $i2 in array element at - line 13.
Use of uninitialized value $i3 in hash element at - line 13.
Use of uninitialized value $i4 in array element at - line 13.
Use of uninitialized value $i5 in hash element at - line 13.
Use of uninitialized value $i6 in array element at - line 13.
Use of uninitialized value $i7 in hash element at - line 13.
Use of uninitialized value $i8 in array element at - line 13.
Use of uninitialized value $i9 in hash element at - line 13.
Use of uninitialized value $i10 in array element at - line 13.
Use of uninitialized value $i11 in hash element at - line 13.
Use of uninitialized value $i12 in array element at - line 13.
Use of uninitialized value $i13 in hash element at - line 13.
Use of uninitialized value $i0 in hash element at - line 14.
Use of uninitialized value $i1 in array element at - line 14.
Use of uninitialized value $i2 in hash element at - line 14.
Use of uninitialized value $i3 in array element at - line 14.
Use of uninitialized value $i4 in hash element at - line 14.
Use of uninitialized value $i5 in array element at - line 14.
Use of uninitialized value $i6 in hash element at - line 14.
Use of uninitialized value $i7 in array element at - line 14.
Use of uninitialized value $i8 in hash element at - line 14.
Use of uninitialized value $i9 in array element at - line 14.
Use of uninitialized value $i10 in hash element at - line 14.
Use of uninitialized value $i11 in array element at - line 14.
Use of uninitialized value $i12 in hash element at - line 14.
Use of uninitialized value $i13 in array element at - line 14.
########
# misc multideref
use warnings 'uninitialized';
my ($i,$j,$k);
my @a;
my @ra = \@a;
my $v;
$v = exists $a[$i]{$k};
$v = delete $a[$i]{$k};
$v = local $a[$i]{$k};
delete $a[$i]{$k};
$v = $ra->[$i+$j]{$k};
$v = ($ra//0)->[$i]{$k};
$v = $a[length $i]{$k}
EXPECT
Use of uninitialized value $i in array element at - line 7.
Use of uninitialized value $k in exists at - line 7.
Use of uninitialized value $i in array element at - line 8.
Use of uninitialized value $k in delete at - line 8.
Use of uninitialized value $i in array element at - line 9.
Use of uninitialized value $k in hash element at - line 9.
Use of uninitialized value $k in hash element at - line 9.
Use of uninitialized value $k in hash element at - line 9.
Use of uninitialized value $i in array element at - line 10.
Use of uninitialized value $k in delete at - line 10.
Use of uninitialized value $j in addition (+) at - line 11.
Use of uninitialized value $i in addition (+) at - line 11.
Use of uninitialized value $k in hash element at - line 11.
Use of uninitialized value $i in array element at - line 12.
Use of uninitialized value $k in hash element at - line 12.
Use of uninitialized value length($i) in array element at - line 13.
Use of uninitialized value $k in hash element at - line 13.
########
# perl #127877
use warnings 'uninitialized';
my ($p, $q, $r, $s, $t, $u, $v, $w, $x, $y);
$p = $p . "a";
$q .= "a";
$r = $r + 17;
$s += 17;
$t = $t - 17;
$u -= 17;
use integer;
$v = $v + 17;
$w += 17;
$x = $x - 17;
$y -= 17;
EXPECT
Use of uninitialized value $p in concatenation (.) or string at - line 4.
Use of uninitialized value $r in addition (+) at - line 6.
Use of uninitialized value $t in subtraction (-) at - line 8.
Use of uninitialized value $v in integer addition (+) at - line 11.
Use of uninitialized value $x in integer subtraction (-) at - line 13.
########
# NAME 64-bit array subscripts
# SKIP ? length(pack "p", "") < 8
use warnings 'uninitialized';

# aelem + const
use constant foo => \0;
$SIG{__WARN__} = sub {
 print STDERR
   $_[0] =~ /\$a\[([^]]+)]/ && $1 == foo
       ? "ok\n"
       : ("$1 != ",0+foo,"\n")
};
() = "$a[foo]";
undef $SIG{__WARN__};

# Multideref
() = "$a[140688675223280]";
EXPECT
ok
Use of uninitialized value $a[140688675223280] in string at - line 15.
########
# RT #128940
use warnings 'uninitialized';
my $x = "" . open my $fh, "<", "no / such / file";
EXPECT
Use of uninitialized value in concatenation (.) or string at - line 3.
########
# RT #123910
# undef's arg being undef doesn't trigger warnings - any warning will be
# from tied/magic vars
use warnings 'uninitialized';
undef $0;
EXPECT
Use of uninitialized value in undef operator at - line 5.
########
# RT #134275
# This was SEGVing due to the multideref code in S_find_uninit_var not
# handling a GV with a null gp_hv slot.
use warnings 'uninitialized';
"" =~ /$foo{a}${*foo=*bar}$x/;
EXPECT
Use of uninitialized value in regexp compilation at - line 5.
Use of uninitialized value in regexp compilation at - line 5.
Use of uninitialized value $x in regexp compilation at - line 5.
########
# GH #20945
use warnings 'uninitialized';
my ($v, $x, $y, @arr, %hash);

$v = ($x = undef) + 1;
$v = 1 + ($x = undef);
$v = ($x = $y) - 1;
$v = 1 - ($x = $y);
$v = ($x = []->[0]) + ($y = [1]->[0]);
$v = ($x = [1]->[0]) + ($y = []->[0]);
$v = ($x = ()) * 2;
(my $z = $y) =~ s/a/b/;
($arr[0] = undef) =~ s/a/b/;
($arr[0] = $z) =~ s/a/b/;
($hash{foo} = undef) =~ s/a/b/;
($hash{foo} = $z) =~ s/a/b/;
EXPECT
Use of uninitialized value $x in addition (+) at - line 5.
Use of uninitialized value $x in addition (+) at - line 6.
Use of uninitialized value $x in subtraction (-) at - line 7.
Use of uninitialized value $x in subtraction (-) at - line 8.
Use of uninitialized value $x in addition (+) at - line 9.
Use of uninitialized value $y in addition (+) at - line 10.
Use of uninitialized value $x in multiplication (*) at - line 11.
Use of uninitialized value $z in substitution (s///) at - line 12.
Use of uninitialized value $arr[0] in substitution (s///) at - line 13.
Use of uninitialized value $arr[0] in substitution (s///) at - line 14.
Use of uninitialized value $hash{"foo"} in substitution (s///) at - line 15.
Use of uninitialized value $hash{"foo"} in substitution (s///) at - line 16.
########
# GH #21930
use warnings 'uninitialized';
my $x;
our $x_pkg;

$_ = length do {} == 0;
$_ = length $x == 0;
$_ = length $x_pkg == 0;
$_ = length length length $x == 0;
$_ = length length length $x_pkg == 0;

my @arr;
my $ref = [];
$_ = shift @arr == 0;
$_ = pop @arr == 0;
$_ = shift @$ref == 0;
$_ = pop @$ref == 0;
$_ = length shift @arr == 0;
$_ = length pop @arr == 0;
$_ = length shift @$ref == 0;
$_ = length pop @$ref == 0;

$_ = splice(@arr, 0, 0) == 0;

# GH #21960
$_ = lc shift;
$_ = sub { lc shift }->();
$_ = lc pop;
$_ = sub { lc pop }->();
EXPECT
Use of uninitialized value in numeric eq (==) at - line 6.
Use of uninitialized value length($x) in numeric eq (==) at - line 7.
Use of uninitialized value length($x_pkg) in numeric eq (==) at - line 8.
Use of uninitialized value length(length(length($x))) in numeric eq (==) at - line 9.
Use of uninitialized value length(length(length($x_pkg))) in numeric eq (==) at - line 10.
Use of uninitialized value shift(@arr) in numeric eq (==) at - line 14.
Use of uninitialized value pop(@arr) in numeric eq (==) at - line 15.
Use of uninitialized value in numeric eq (==) at - line 16.
Use of uninitialized value in numeric eq (==) at - line 17.
Use of uninitialized value length(shift(@arr)) in numeric eq (==) at - line 18.
Use of uninitialized value length(pop(@arr)) in numeric eq (==) at - line 19.
Use of uninitialized value in numeric eq (==) at - line 20.
Use of uninitialized value in numeric eq (==) at - line 21.
Use of uninitialized value in numeric eq (==) at - line 23.
Use of uninitialized value shift(@ARGV) in lc at - line 26.
Use of uninitialized value shift() in lc at - line 27.
Use of uninitialized value pop(@ARGV) in lc at - line 28.
Use of uninitialized value pop() in lc at - line 29.