Wrongly positioned "+ Send + Sync + 'static" in complex bound.

Summary

Input code:

pub fn layer<L>(self, layer: L) -> Self
where
    L: Layer<
        Route,
        Service: Service<
            Request,
            Response: IntoResponse + 'static,
            Error: Into<Infallible> + 'static,
            Future: Send + 'static,
        > + Clone + Send + Sync + 'static,
    > + Clone + Send + Sync + 'static,
{
    map_inner!(self, this => RouterInner {
        path_router: this.path_router.layer(layer.clone()),
        default_fallback: this.default_fallback,
        catch_all_fallback: this.catch_all_fallback.map(|route| route.layer(layer)),
    })
}

What rustfmt formats it as:

pub fn layer<L>(self, layer: L) -> Self
where
    L: Layer<
            Route,
            Service: Service<
                Request,
                Response: IntoResponse + 'static,
                Error: Into<Infallible> + 'static,
                Future: Send + 'static,
            > + Clone
                         + Send
                         + Sync
                         + 'static,
        > + Clone
        + Send
        + Sync
        + 'static,
{
    map_inner!(self, this => RouterInner {
        path_router: this.path_router.layer(layer.clone()),
        default_fallback: this.default_fallback,
        catch_all_fallback: this.catch_all_fallback.map(|route| route.layer(layer)),
    })
}

Configuration

rustfmt --version:

rustfmt 1.9.0-nightly (9eb3be26b4 2026-05-18)

No source file or test is named. Start by running the supplied Rust reproducer through the reported rustfmt version and compare its formatting with the input. Trace the formatter path for the nested where-clause bounds; done means the + Send + Sync + 'static bounds are positioned correctly rather than expanded at the wrong nesting level.