Re: [m-users.] Confused my det/multi error message, full disjunction of type in place.
"Sean Charles (emacstheviking)" <[email protected]>
| Newsgroups | gmane.comp.lang.mercury.general |
|---|---|
| Message-ID | <[email protected]> |
> On 4 Dec 2022, at 10:50, Julien Fischer <[email protected]> wrote: > > On Sun, 4 Dec 2022, Sean Charles (emacstheviking) wrote: > >> And the code, I just don't understand, as usual, what the compiler is >> trying to tell me. The io.nl/2 <http://io.nl/2> is det, so that can't fail, and >> presumably the field update can't fail either. And why hasn't this >> error been raised on all the other cases? >> 59 :- pred write_(fstate::in, fstate::out, fi::in, io::di, io::uo) is det. >> 60 >> 61 write_(!S, nl, !IO) :- >> 62 io.nl <http://io.nl/>(!IO), >> 63 !:S = !.S ^nl_written := yes. >> 64 >> 65 write_(!S, brace_o, !IO) :- >> 66 write_(!S, s("{"), !IO), >> 67 !:S = !.S ^tab_size := !.S ^tab_size+1. > ^^^ >> 68 write_(!S, nl, !IO). > > Presuambly, the period marked above is actually supposed to be a comma. > (Because it's a period, you have two clauses that match nl.) Why would it be a comma? I just don't understand, "!,S" ??? That's a syntax error surely? _______________________________________________ users mailing list [email protected] https://lists.mercurylang.org/listinfo/users