SOURCE_FILE
  STRUCT
    VISIBILITY
      PUB_KW "pub"
      L_PAREN "("
      PATH
        PATH_SEGMENT
          ERROR
            R_PAREN ")"
    WHITESPACE " "
    STRUCT_KW "struct"
    WHITESPACE " "
    NAME
      IDENT "S"
    SEMICOLON ";"
  WHITESPACE "\n"
error 4: expected identifier
error 5: expected R_PAREN
