ICE when passing format!() to doc_comment!()

[DoubleHyphen]

Example code:

macro_rules! doc_comment {
    ($x:expr) => {
        #[doc = $x]
        extern {
}};}

macro_rules! some_macro {
    ($t1: ty) => {
        doc_comment!{format!("{coor}", coor = stringify!($t1)).as_str()
}}}

fn main() {
    some_macro!(u8);
}

Expected result: The compiler does not crash.
Actual result: The compiler crashes, and asks for the crash to be reported as a bug.
Workaround: Using concat!() instead of format!()
Likely cause: concat!() returns a &str, whereas format!() returns a String.

[jonas-schievink]

Duplicate of #66804