SOURCE_FILE
  CONST
    CONST_KW "const"
    WHITESPACE " "
    UNDERSCORE "_"
    COLON ":"
    WHITESPACE " "
    SLICE_TYPE
      L_BRACK "["
      REF_TYPE
        AMP "&"
      R_BRACK "]"
    SEMICOLON ";"
  WHITESPACE "\n"
error 11: expected type
