Errors in choice() and .or()

[artegoser]

Hi. I have multiple parsers, they are all in choice(). One of them gets an invalid argument error, but the main parser with choice() ends up getting a "multiple errors" error. Also, it identifies the correct span where the error occurred, but displays "multiple errors". How can i get the output of invalid argument errors.

I have read that in this case chumsky tries to get the most informative error, but for some reason it does not work for me.

Errors occured here:

let hlarg = num_arg
    .try_map(|n, s| Hl::try_from(n).map_err(|e| Rich::custom(s, e)));

Parsing of tag with this parser:

let h = just(Token::H)
    .ignore_then(hlarg)
    .then(text_body)
    .map(|(level, body)| H(body, level));

Main parser:

choice((
    el, h, p, br, ul, ol, row, link, navlink, btn, navbtn, img, table, tcol, tpcol, hr, b,
    i, bq, footlnk, footn, a, s, sup, sub, disc,
))
.or(choice((block, carousel, code, pre, meta)))
.or(choice((el_text, el_tags, paragraph)))

Source: https://github.com/TxtDot/dalet-rs/blob/main/src/daleth/parser/mod.rs

[zesterer]

When you say 'displays multiple errors', what do you mean? Are you seeing this variant?

[artegoser]

Oh, now I see it. I was using ariadne and just calling the .to_string method on the message. This method was giving "multiple errors". I thought all errors were output separately and only the main parser output could have multiple errors. Anyway, now it makes sense. Thanks.

Perhaps for simplicity, the .to_string() method for Multiple variant can be changed so that it outputs the body of several errors at once, instead of writing "multiple errors".

[zesterer]

The Many variant is due for removal anyway. It is confusing to most users as you say, and has questionable benefits.