Drifting/unstable formatting when using a macro in an attribute inside a macro definition

[elomatreb]

The following snippet has weird/partially unstable formatting:

macro_rules! foo {
    () => {
        #[doc =
            concat!("hello world")
        ]
        pub struct Foo;
    };
}

(playground)

Formatting it once makes the contents of the doc attribute and its closing bracket drift right:

macro_rules! foo {
    () => {
        #[doc =
                    concat!("hello world")
                ]
        pub struct Foo;
    };
}

This happens again and again with every format until it hits the line length limit (I think):

macro_rules! foo {
    () => {
        #[doc =
                                                                        concat!("hello world")
                                                                    ]
        pub struct Foo;
    };
}

This does not happen outside of a macro_rules body or if the doc attribute does not contain another macro.

[ytmimi]

Thanks for reaching out. This is likely a duplicate of #5489, #5062

[elomatreb]

Right, that looks likely, didn't find those while searching.

Should I close this issue?

[ytmimi]

Yeah, let's close this.