// https://github.com/rust-lang/rust/issues/50159
#![crate_name = "foo"]

pub trait Signal {
    type Item;
}

pub trait Signal2 {
    type Item2;
}

impl<B, C> Signal2 for B
where
    B: Signal<Item = C>,
{
    type Item2 = C;
}

//@ has foo/struct.Switch.html
//@ has - '//h3[@class="code-header"]' 'impl<B> Send for Switch<B>where <B as Signal>::Item: Send'
//@ has - '//h3[@class="code-header"]' 'impl<B> Sync for Switch<B>where <B as Signal>::Item: Sync'
//@ count - '//*[@id="implementations-list"]//*[@class="impl"]' 0
//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 6
pub struct Switch<B: Signal> {
    pub inner: <B as Signal2>::Item2,
}