no warnings 'uninitialized' ;
$u = undef; $v = $$u;
EXPECT
-Use of uninitialized value in scalar dereference at - line 3.
+Use of uninitialized value $x in scalar dereference at - line 3.
########
# pp.c
use warnings 'misc' ;
$_ = "\x80 \xff" ;
reverse ;
EXPECT
-########
-# pp.c
-use warnings;
-$a = "b" x -1;
-$a = "b" x 0;
-no warnings;
-$a = "b" x -1;
-EXPECT
-Negative repeat count at - line 3.