SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE "\n    "
    WHERE_CLAUSE
      WHERE_KW "where"
      WHITESPACE " "
      WHERE_PRED
        FOR_KW "for"
        GENERIC_PARAM_LIST
          L_ANGLE "<"
          LIFETIME_PARAM
            LIFETIME
              LIFETIME_IDENT "'a"
          R_ANGLE ">"
    WHITESPACE "\n"
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        R_CURLY "}"
  WHITESPACE "\n"
error 26: expected type
error 26: expected colon