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use disjoint_impls::disjoint_impls;
pub trait Dispatch {
type Group;
}
pub enum GroupA {}
impl Dispatch for Option<String> {
type Group = GroupA;
}
pub enum GroupB {}
impl Dispatch for i32 {
type Group = GroupB;
}
struct Wrapper<T>(T);
disjoint_impls! {
impl<T> Wrapper<T>
where
Option<T>: Dispatch<Group = GroupA>,
{
fn kita() -> &'static str {
"Blanket A"
}
}
impl<T> Wrapper<T>
where
T: Dispatch<Group = GroupB>,
{
fn kita() -> String {
"Blanket B".to_owned()
}
}
}
/*
const _: () = {
impl<T> Wrapper<T>
where
Option<T>: Dispatch<Group = GroupA>,
{
fn kita() -> &'static str {
"Blanket A"
}
}
impl<T> Wrapper<T>
where
T: Dispatch<Group = GroupB>,
{
fn kita() -> String {
"Blanket B".to_owned()
}
}
};
*/
#[test]
fn differing_inherent_items() {
assert_eq!("Blanket A", Wrapper::<String>::kita());
assert_eq!("Blanket B".to_owned(), Wrapper::<i32>::kita());
}