Catch And Endcatch In System Exceptions

REPORT zcatch_endcatch.

DATA: BEGIN OF ifile OCCURS 0,
rec(150),
END OF ifile.

PARAMETERS: path(99) TYPE c LOWER CASE
DEFAULT '/usr/sap/TST/SYS/TEST001.txt'.

OPEN DATASET path FOR INPUT IN TEXT MODE ENCODING DEFAULT.

CATCH SYSTEM-EXCEPTIONS dataset_cant_open = 1.
DO.
READ DATASET path INTO ifile-rec.
IF sy-subrc EQ 0.
APPEND ifile.
ELSE.
EXIT.
ENDIF.
ENDDO.
ENDCATCH.

IF sy-subrc = 1.
WRITE:/ 'File could not be opened'.
ENDIF.