Code before warnings are enabled at line 10, column 1.  See page 431 of PBP.  (Severity: 4)
String delimiter used with "split" at line 82, column 19.  Express it as a regex instead.  (Severity: 2)
String delimiter used with "split" at line 137, column 14.  Express it as a regex instead.  (Severity: 2)
Return value of "open" ignored at line 295, column 5.  Check the return value of "open" for success.  (Severity: 3)
Return value of "open" ignored at line 296, column 5.  Check the return value of "open" for success.  (Severity: 3)