$a = "\x{100}\x{200}"; $a = -$a;
EXPECT
Argument "\x{100}\x{200}" isn't numeric in negation (-) at - line 3.
-########
-# sv.c
-open F, ">".($^O eq 'VMS'? 'NL:' : '/dev/null') ;
-use warnings 'printf';
-$a = "a\nb";
-$s = sprintf "%4s", $a;
-printf F "%4s", $a;
-$s = sprintf "%-4s", $a;
-printf F "%-4s", $a;
-$s = sprintf "%*s", -4, $a;
-no warnings 'printf';
-$s = sprintf "%4s", $a;
-printf F "%4s", $a;
-$s = sprintf "%-4s", $a;
-printf F "%-4s", $a;
-EXPECT
-Newline in left-justified string for sprintf at - line 7.
-Newline in left-justified string for printf at - line 8.
-Newline in left-justified string for sprintf at - line 9.