Misformatting: excessive indentation due to `dyn` in type alias

I have some pretty complicated type aliases to hide away type complexity (boxed dyn Futures with generics).

Rustfmt formats them like this:

pub type AccountVerifyFuture<D, A> = Pin<
    Box<
        dyn Future<
                Output = Result<
                    VerifySuccess,
                    VerifyError<<D as AccountData>::Error, <A as AccountVerifier<D>>::Error>,
                >,
            > + Send,
    >,
>;
pub type GameExtrasProcessFuture<G> = Pin<
    Box<
        dyn Future<
                Output = Result<
                    (),
                    GameError<
                        <<G as GameExtrasHandler>::Data as GameExtras>::Error,
                        <G as GameExtrasHandler>::Error,
                    >,
                >,
            > + Send,
    >,
>;

Notice how the presence of the dyn keyword caused everything to be indented further in, by an additional 4 spaces (closing > aligns with Future).

I'd expect the above code to be formated like this:

pub type AccountVerifyFuture<D, A> = Pin<
    Box<
        dyn Future<
            Output = Result<
                VerifySuccess,
                VerifyError<<D as AccountData>::Error, <A as AccountVerifier<D>>::Error>,
            >,
        > + Send,
    >,
>;
pub type GameExtrasProcessFuture<G> = Pin<
    Box<
        dyn Future<
            Output = Result<
                (),
                GameError<
                    <<G as GameExtrasHandler>::Data as GameExtras>::Error,
                    <G as GameExtrasHandler>::Error,
                >,
            >,
        > + Send,
    >,
>;

Note how the closing > now aligns with the dyn, and there is no excessive indentation of everything inside the Future.

Reproduce the two type-alias examples from the issue with rustfmt, then trace the formatting path for dyn and nested generic bounds. Done means the output matches the expected indentation without the extra four-space shift.