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use disjoint_impls::disjoint_impls;
pub trait Dispatch {
type Group;
}
pub trait A {}
pub trait B {}
pub enum GroupA {}
impl A for String {}
impl Dispatch for String {
type Group = GroupA;
}
impl<T> A for Vec<T> {}
impl<T> Dispatch for Vec<T> {
type Group = GroupA;
}
pub enum GroupB {}
impl B for i32 {}
impl Dispatch for i32 {
type Group = GroupB;
}
impl B for u32 {}
impl Dispatch for u32 {
type Group = GroupB;
}
disjoint_impls! {
pub trait Kita<U> {
const NAME: &'static str;
}
impl<T: Dispatch<Group = GroupA> + Dispatch + A> Kita<u32> for T {
const NAME: &'static str = "Blanket A";
}
impl<T: Dispatch<Group = GroupB>> Kita<u32> for T
where
T: B + Dispatch<Group = GroupB>,
{
const NAME: &'static str = "Blanket B";
}
}
/*
pub trait Kita<U> {
const NAME: &'static str;
}
const _: () = {
pub trait Kita0<_TŠČ1: ?core::marker::Sized, _TŠČ0>: Kita<_TŠČ0> {
const NAME_šč: &'static str;
}
impl<T: Dispatch<Group = GroupA> + Dispatch + A> Kita0<GroupA, u32> for T {
const NAME_šč: &'static str = "Blanket A";
}
impl<T: Dispatch<Group = GroupB>> Kita0<GroupB, u32> for T
where
T: B + Dispatch<Group = GroupB>,
{
const NAME_šč: &'static str = "Blanket B";
}
impl<_TŠČ0> Kita<u32> for _TŠČ0
where
_TŠČ0: Dispatch,
Self: for<'_dšč> Kita0<<_TŠČ0 as Dispatch>::Group, u32>,
{
const NAME: &'static str = <Self as Kita0<
<_TŠČ0 as Dispatch>::Group,
u32,
>>::NAME_šč;
}
};
*/
#[test]
fn extra_param_bounds() {
assert_eq!("Blanket A", String::NAME);
assert_eq!("Blanket A", Vec::<u32>::NAME);
assert_eq!("Blanket B", u32::NAME);
assert_eq!("Blanket B", i32::NAME);
}