Code before warnings are enabled at line 9, column 1.  See page 431 of PBP.  (Severity: 4)
Always unpack @_ first at line 19, column 1.  See page 178 of PBP.  (Severity: 4)
Subroutine "baz" does not end with "return" at line 19, column 1.  See page 197 of PBP.  (Severity: 4)