regress/roff/esc/unsupp.out_lint

   1 mandoc: unsupp.in:7:20: UNSUPP: unsupported escape sequence: \!
   2 mandoc: unsupp.in:7:23: ERROR: invalid special character: \[!]
   3 mandoc: unsupp.in:8:17: UNSUPP: unsupported escape sequence: \?
   4 mandoc: unsupp.in:8:21: UNSUPP: unsupported escape sequence: \?
   5 mandoc: unsupp.in:8:24: ERROR: invalid special character: \[?]