Code before warnings are enabled at line 6, column 1.  See page 431 of PBP.  (Severity: 4)
Return value of "close" ignored at line 103, column 9.  Check the return value of "close" for success.  (Severity: 2)
Return value of "close" ignored at line 115, column 13.  Check the return value of "close" for success.  (Severity: 2)
Return value of "close" ignored at line 125, column 5.  Check the return value of "close" for success.  (Severity: 2)
Expression form of "eval" at line 130, column 18.  See page 161 of PBP.  (Severity: 5)
String delimiter used with "split" at line 186, column 15.  Express it as a regex instead.  (Severity: 2)
String delimiter used with "split" at line 264, column 12.  Express it as a regex instead.  (Severity: 2)