rustfmt gets upset when trying to format a let-else block inside a macro.

[vincenzopalazzo]

This what rustfmt produces when I run the code formatting

#[macro_export]
macro_rules! from_cstr {
    ($x:expr) => {{
        use std::ffi::CStr;
        let c_str = unsafe { CStr::from_ptr($x) };
        let Ok(c_str) = c_str.to_str() else {
                                                                                    return null!()
                                                                                };
        c_str
    }};
}

[ytmimi]

Thanks for reaching out. This is a duplicate of #5503.

The reason for the infinite indentation is that we haven't landed support for let-else in rustfmt yet. You can subscribe to #5690 for updates on when that work is done.

In the meantime you might want to use #[rustfmt::skip] to prevent rustfmt from messing with the formatting.

#[rusfmt::skip]
#[macro_export]
macro_rules! from_cstr {
    ($x:expr) => {{
        use std::ffi::CStr;
        let c_str = unsafe { CStr::from_ptr($x) };
        let Ok(c_str) = c_str.to_str() else {
            return null!();
        };
        c_str
    }};
}