1 warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
2 --> $DIR/equality.rs:1:12
4 LL | #![feature(specialization)]
7 = note: `#[warn(incomplete_features)]` on by default
8 = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
9 = help: consider using `min_specialization` instead, which is more stable and complete
11 error[E0308]: mismatched types
12 --> $DIR/equality.rs:15:5
14 LL | fn two(x: bool) -> impl Foo {
15 | -------- the expected opaque type
18 | ^^^^^ expected `i32`, found `u32`
20 = note: expected opaque type `impl Foo`
23 error[E0277]: cannot add `impl Foo` to `u32`
24 --> $DIR/equality.rs:24:11
26 LL | n + sum_to(n - 1)
27 | ^ no implementation for `u32 + impl Foo`
29 = help: the trait `Add<impl Foo>` is not implemented for `u32`
31 error[E0283]: type annotations needed
32 --> $DIR/equality.rs:21:5
37 LL | | n + sum_to(n - 1)
40 | |_____^ cannot infer type for type `{integer}`
42 = note: multiple `impl`s satisfying `{integer}: ToString` found in the `alloc` crate:
43 - impl ToString for i8;
44 - impl ToString for u8;
45 note: required because of the requirements on the impl of `Foo` for `{integer}`
46 --> $DIR/equality.rs:5:26
48 LL | impl<T: Copy + ToString> Foo for T {}
51 error: aborting due to 3 previous errors; 1 warning emitted
53 Some errors have detailed explanations: E0277, E0283, E0308.
54 For more information about an error, try `rustc --explain E0277`.