Function try_explicit_named_args

impl/src/fmt.rs:192–229

(input: ParseStream)

}

fn try_explicit_named_args(input: ParseStream) -> Result<FmtArguments> {
    let mut syn_full = None;
    let mut args = FmtArguments {
        named: BTreeSet::new(),
        first_unnamed: None,
    };

    while !input.is_empty() {
        input.parse::<Token![,]>()?;
        if input.is_empty() {
            break;
        }

        let mut begin_unnamed = None;
        if input.peek(Ident::peek_any) && input.peek2(Token![=]) && !input.peek2(Token![==]) {
            let ident: IdentUnraw = input.parse()?;
            input.parse::<Token![=]>()?;
            args.named.insert(ident);
        } else {
            begin_unnamed = Some(input.fork());
        }

        let ahead = input.fork();
        if *syn_full.get_or_insert_with(is_syn_full) && ahead.parse::<Expr>().is_ok() {
            input.advance_to(&ahead);
        } else {
            scan_expr(input)?;
        }

        if let Some(begin_unnamed) = begin_unnamed {
            if args.first_unnamed.is_none() {
                args.first_unnamed = Some(between(&begin_unnamed, input));
            }
        }
    }

    Ok(args)
}

fn fallback_explicit_named_args(input: ParseStream) -> Result<FmtArguments> {
    let mut args = FmtArguments {