[perl #87708] $tied % $tied and $tied * $tied under use integer

[perl5.git] / t / lib / warnings / 9uninit

diff --git a/t/lib/warnings/9uninit b/t/lib/warnings/9uninit
index 570290a..10f0a7c 100644 (file)
--- a/t/lib/warnings/9uninit
+++ b/t/lib/warnings/9uninit
@@ -282,13 +282,13 @@ print STDERR $ga[1000];
 print STDERR $m1, $g1, $ga[1],$m2;
 print STDERR "", $ga[1],"";
 EXPECT
-Use of uninitialized value $ga[1000] in print at - line 5.
-Use of uninitialized value $ga[1000] in print at - line 6.
+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 $ga[1] in print at - line 8.
+Use of uninitialized value in print at - line 8.
 ########
 use warnings 'uninitialized';
 my ($m1);
@@ -380,8 +380,8 @@ 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 $s4 in chomp at - line 5.
 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 $s6 in chop at - line 6.
 ########
@@ -396,8 +396,8 @@ chomp ($x, $y); chop ($x, $y);
 EXPECT
 Use of uninitialized value ${$/} in scalar chomp at - line 6.
 Use of uninitialized value ${$/} in chomp at - line 8.
-Use of uninitialized value $y in chomp at - line 8.
 Use of uninitialized value ${$/} in chomp at - line 8.
+Use of uninitialized value $y in chomp at - line 8.
 Use of uninitialized value $y in chop at - line 8.
 ########
 use warnings 'uninitialized';
@@ -446,6 +446,83 @@ 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 in range (or flop) at - line 9.
+Use of uninitialized value in range (or flop) at - line 9.
+Use of uninitialized value $m1 in range (or flop) at - line 12.
+Use of uninitialized value $m2 in range (or flop) at - line 13.
+Use of uninitialized value in range (or flop) at - line 14.
+Use of uninitialized value in range (or flop) at - line 14.
+########
+use warnings 'uninitialized';
 my ($m1, $v);
 our ($g1);
 
@@ -479,31 +556,31 @@ $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 $g1 in integer addition (+) at - line 6.
 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 $g1 in integer subtraction (-) at - line 7.
 Use of uninitialized value $m1 in integer multiplication (*) at - line 8.
+Use of uninitialized value $g1 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 $g1 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 $g1 in integer lt (<) at - line 13.
 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 $g1 in integer gt (>) at - line 14.
 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 $g1 in integer le (<=) at - line 15.
 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 $g1 in integer ge (>=) at - line 16.
 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 $g1 in integer eq (==) at - line 17.
 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 $g1 in integer ne (!=) at - line 18.
 Use of uninitialized value $m1 in integer comparison (<=>) at - line 19.
+Use of uninitialized value $g1 in integer comparison (<=>) at - line 19.
 Use of uninitialized value $m1 in integer negation (-) at - line 20.
 ########
 use warnings 'uninitialized';
@@ -833,8 +910,8 @@ $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 $g1 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.
@@ -1125,7 +1202,6 @@ 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 of uninitialized value $m1 in binmode at - line 23.
 ########
 use warnings 'uninitialized';
 my ($m1);
@@ -1139,7 +1215,6 @@ 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 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.
@@ -1168,15 +1243,15 @@ 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 $ga[1000] in printf at - line 7.
-Use of uninitialized value $ga[1000] in printf at - line 8.
+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 $ga[1] in printf at - line 10.
+Use of uninitialized value in printf at - line 10.
 FOO3:XY
 ########
 use warnings 'uninitialized';
@@ -1332,6 +1407,65 @@ 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;
@@ -1343,3 +1477,471 @@ my $b
 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 + 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';
+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.