regress/roff/esc/O.out_lint

   1 mandoc: O.in:11:6: WARNING: invalid escape sequence: \O5
   2 mandoc: O.in:12:7: WARNING: invalid escape sequence: \O(52
   3 mandoc: O.in:13:7: UNSUPP: unsupported escape sequence: \O[5dummy]
   4 mandoc: O.in:14:6: WARNING: invalid escape sequence: \O6
   5 mandoc: O.in:15:6: UNSUPP: unsupported escape sequence: \O0