Defining generics in a macro inside macro causes infinite indentation

macro_rules! example {
    (good) => {
        macro_rules! good {
            () => {
                A
            };
        }
    };
    (bad) => {
        macro_rules! bad {
            () => {
                A<'a>
            };
        }
    };
    (alsobad) => {
        macro_rules! bad {
            () => {
                A<B>
            };
        }
    };
}

Running multiple rounds of fmt in this causes both versions of bad's body to be indented indefinitely, but not good's.
Might be related to #4609, #5044 and other issues involving infinite indentation, but none of them mentioned generics.

Start with the minimal macro_rules reproduction in this issue and run rustfmt through multiple rounds to observe the increasing indentation. Review related infinite-indentation issues #4609 and #5044 for relevant investigation context. Done means nested generic and lifetime-like bodies remain stable across repeated formatting, while the good case continues to format correctly.