tests/target/issue-3840/version-one_soft-tabs.rs

impl<
        Target: FromEvent<A> + FromEvent<B>,
        A: Widget2<Ctx = C>,
        B: Widget2<Ctx = C>,
        C: for<'a> CtxFamily<'a>,
    > Widget2 for WidgetEventLifter<Target, A, B>
{
    type Ctx = C;
    type Event = Vec<Target>;
}

mod foo {
    impl<
            Target: FromEvent<A> + FromEvent<B>,
            A: Widget2<Ctx = C>,
            B: Widget2<Ctx = C>,
            C: for<'a> CtxFamily<'a>,
        > Widget2 for WidgetEventLifter<Target, A, B>
    {
        type Ctx = C;
        type Event = Vec<Target>;
    }
}