`type t````=`

`|` `Unexpected_char_parsing_hex_escape`
`|` `Unexpected_char_parsing_dec_escape`
`|` `Unterminated_quoted_string`
`|` `Unterminated_block_comment`
`|` `Escape_sequence_out_of_range`
`|` `Unclosed_paren`
`|` `Too_many_sexps`
`|` `Closed_paren_without_opened`
`|` `Comment_token_in_unquoted_atom`
`|` `Sexp_comment_without_sexp`
`|` `Unexpected_character_after_cr`
`|` `No_sexp_found_in_input`
`|` `Automaton_in_error_state`

``