The format_xml from casualx

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Better composable XMLs support

I'd like to compose XMLs with functions. That works but solution is a bit noisy:

use format_xml::xml;

fn f(x: u8, y: u8) -> String {
    let result = xml! {
        <A>{x}</A>
        <B>{y}</B>
    }
    .to_string();
    result
}

fn main() {
    let x = xml! {
        <C>
            {f(1, 2)}
        </C>
        <C>
            {f(2, 1)}
        </C>
    }
    .to_string();
    println!("{}", x);
}

Removing intermediate result variable

fn f(x: u8, y: u8) -> String {
    xml! {
        <A>{x}</A>
        <B>{y}</B>
    }
    .to_string()
}

causes unobvious compiler error:

error: expected expression, found `.`
 --> src/main.rs:8:5
  |
8 |     .to_string()
  |     ^ expected expression

error[E0308]: mismatched types
 --> src/main.rs:4:5
  |
4 | /     xml! {
5 | |         <A>{x}</A>
6 | |         <B>{y}</B>
7 | |     }
  | |     ^
  | |     |
  | |_____expected `()`, found struct `std::fmt::Arguments`
  |       help: consider using a semicolon here
  |
  = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

Which can be fixed by wrapping xml! macros usage with () or {}:

fn f(x: u8, y: u8) -> String {
    (xml! {
        <A>{x}</A>
        <B>{y}</B>
    })
    .to_string()
}

Returning std::fmt::Arguments without constructing intermediate String would be even better, but I didn't find a way to satisfy borrow checker.

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