SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "main"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        ERROR
          LABEL
            LIFETIME
              LIFETIME_IDENT "'loop"
            COLON ":"
        WHITESPACE " "
        IMPL
          IMPL_KW "impl"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
error 22: expected a loop or block
error 27: expected type
error 27: expected `{`