$ perl5.8.8 /tmp/z.pl
About to set $SIG{CHLD}
About to set $SIG{CHLD}
encountered CODE(0x10ec290), but JSON can only represent references to arrays or hashes at /tmp/z.pl line 162
encountered CODE(0x10ec290), but JSON can only represent references to arrays or hashes at /tmp/z.pl line 162