Bug#618866: Use of uninitialized value complaints

[jidanni at jidanni.org]

Plus can you believe it doesn't complain about line 1? That's a genuine
bug for you.
$ cat ss
printf "%s";
printf "%s%s", 4;
printf "", 7;
printf "%s", undef;
$ perl -w ss
Use of uninitialized value in printf at ss line 2.
Use of uninitialized value in printf at ss line 4.