tests/trait_impl.rs

#![no_std]
#![deny(unsafe_code)]

#[macro_use]
extern crate static_assertions;

use core::ops::Range;

trait Tri<A: ?Sized, B: ?Sized, C: ?Sized> {}

impl<T, A: ?Sized, B: ?Sized, C: ?Sized> Tri<A, B, C> for T {}

assert_impl_all!(
    u64: Tri<[&'static u8], dyn Tri<dyn Send, dyn Sync, str>, (u16, u16)>
);
assert_impl_all!(u8: Send, Sync);
assert_impl_all!(&'static [u8]: IntoIterator<Item=&'static u8>);
assert_impl_all!(Range<u8>: Iterator<Item=u8>);
assert_impl_all!([u8]: Send, Sync, AsRef<[u8]>);
assert_impl_all!(str: Send, Sync, AsRef<[u8]>,);

assert_impl_any!((): Send, Sync);
assert_impl_any!((): Send, From<u8>);
assert_impl_any!((): From<u8>, From<u16>, Send);

#[allow(dead_code)]
struct Foo;

trait A {}
trait B {}
trait C {}

impl B for Foo {}

assert_impl_one!(Foo: A, B);
assert_impl_one!(Foo: B, A);
assert_impl_one!(Foo: B, C);
assert_impl_one!(Foo: C, B);
assert_impl_one!(Foo: A, B, C);
assert_impl_one!(Foo: B, C, A);
assert_impl_one!(Foo: C, A, B);

#[derive(Clone)]
struct Test;

assert_impl!(u8: (From<u16>) | (Into<u16>));
assert_impl!((): (From<u8>) | (From<u16>) | Send);
assert_impl!((): (!From<u8>) & !(From<u16>) & Send);
assert_impl!((): Copy | Clone);
assert_impl!((): Copy & Clone);
assert_impl!(Test: Copy | Clone);
assert_impl!(Test: !Copy | Clone);
assert_impl!(Test: !Copy & Clone);
assert_impl!(Test: !Copy & (Clone));
assert_impl!(Test: !(Copy) & Clone);
assert_impl!(Test: !(!Clone));
assert_impl!(Test: !(Copy) & !(!Clone));
assert_impl!(Test: !(Copy & Clone));
assert_impl!(str: !Copy & !Clone);

#[derive(Clone)]
struct Box<T>(T);

assert_impl!(for(T: Clone) Box<T>: Clone);
assert_impl!(for(T: Clone + Send) Box<T>: Clone & Send);
assert_impl!(for(T) Box<T>: (From<T>) & (Into<T>));

assert_impl!(for(T) PhantomData<T>: Clone);
assert_impl!(for(T: Copy) T: Clone);
assert_impl!(for(T: ?Sized) T: Clone | !Clone);
assert_impl!(for('a, T: 'a) &'a mut T: !Copy);