New upstream version 1.54.0+dfsg1

[rustc.git] / src / test / ui / associated-type-bounds / lcsit.rs

// run-pass

#![feature(associated_type_bounds)]
#![feature(impl_trait_in_bindings)]
//~^ WARNING `impl_trait_in_bindings` is incomplete
#![allow(non_upper_case_globals)]

use std::ops::Add;

trait Tr1 { type As1; fn mk(&self) -> Self::As1; }
trait Tr2<'a> { fn tr2(self) -> &'a Self; }

fn assert_copy<T: Copy>(x: T) { let _x = x; let _x = x; }
fn assert_static<T: 'static>(_: T) {}
fn assert_forall_tr2<T: for<'a> Tr2<'a>>(_: T) {}

#[derive(Copy, Clone)]
struct S1;
#[derive(Copy, Clone)]
struct S2;
impl Tr1 for S1 { type As1 = S2; fn mk(&self) -> Self::As1 { S2 } }

const cdef_et1: impl Copy + Tr1<As1: Copy> = {
    let x: impl Copy + Tr1<As1: Copy> = S1;
    x
};
static sdef_et1: impl Copy + Tr1<As1: Copy> = cdef_et1;
pub fn use_et1() { assert_copy(cdef_et1.mk()); assert_copy(sdef_et1.mk()); }

const cdef_et2: impl Tr1<As1: 'static> = {
    let x: impl Tr1<As1: 'static> = S1;
    x
};
static sdef_et2: impl Tr1<As1: 'static> = cdef_et2;
pub fn use_et2() { assert_static(cdef_et2.mk()); assert_static(sdef_et2.mk()); }

const cdef_et3: impl Tr1<As1: Clone + Iterator<Item: Add<u8, Output: Into<u8>>>> = {
    struct A;
    impl Tr1 for A {
        type As1 = core::ops::Range<u8>;
        fn mk(&self) -> Self::As1 { 0..10 }
    }
    let x: impl Tr1<As1: Clone + Iterator<Item: Add<u8, Output: Into<u8>>>> = A;
    x
};
pub fn use_et3() {
    let _0 = cdef_et3.mk().clone();
    let mut s = 0u8;
    for _1 in _0 {
        let _2 = _1 + 1u8;
        s += _2.into();
    }
    assert_eq!(s, (0..10).map(|x| x + 1).sum());
}

const cdef_et4: impl Copy + Tr1<As1: for<'a> Tr2<'a>> = {
    #[derive(Copy, Clone)]
    struct A;
    impl Tr1 for A {
        type As1 = A;
        fn mk(&self) -> A { A }
    }
    impl<'a> Tr2<'a> for A {
        fn tr2(self) -> &'a Self { &A }
    }
    let x: impl Copy + Tr1<As1: for<'a> Tr2<'a>> = A;
    x
};

static sdef_et4: impl Copy + Tr1<As1: for<'a> Tr2<'a>> = cdef_et4;
pub fn use_et4() { assert_forall_tr2(cdef_et4.mk()); assert_forall_tr2(sdef_et4.mk()); }

fn main() {
    let _ = use_et1();
    let _ = use_et2();
    let _ = use_et3();
    let _ = use_et4();
}