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//@ compile-flags:-Z unstable-options --show-coverage
//@ check-pass
#![feature(trait_alias)]
#![feature(type_alias_impl_trait)]
/// look at this trait right here
pub trait ThisTrait {
/// that's a trait all right
fn right_here(&self);
/// even the provided functions show up as trait methods
fn aww_yeah(&self) {}
/// gotta check those associated types, they're slippery
type SomeType;
}
/// so what happens if we take some struct...
#[derive(Clone)]
pub struct SomeStruct;
/// ...and slap this trait on it?
impl ThisTrait for SomeStruct {
/// nothing! trait impls are totally ignored in this calculation, sorry.
fn right_here(&self) {}
type SomeType = String;
}
/// but what about those aliases? i hear they're pretty exotic
pub trait MyAlias = ThisTrait + Send + Sync;
/// woah, getting all opaque in here
pub type ThisExists = impl ThisTrait;
/// why don't we get a little more concrete
pub fn defines() -> ThisExists { SomeStruct {} }
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