SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
  ERROR
    R_CURLY "}"
  ERROR
    R_PAREN ")"
  WHITESPACE " "
  ERROR
    L_CURLY "{"
    WHITESPACE "\n"
    R_CURLY "}"
  WHITESPACE "\n"
error 7: expected value parameter
error 7: expected R_PAREN
error 7: expected a block
error 7: unmatched `}`
error 8: expected an item
error 10: expected an item