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 | -------- expected because this return type...
18 | ----- ...is found to be `i32` here
21 | ^^^^^ expected `i32`, found `u32`
23 = note: to return `impl Trait`, all returned values must be of the same type
24 = note: for information on `impl Trait`, see <https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-implement-traits>
25 = help: if the trait `Foo` were object safe, you could return a boxed trait object
26 = note: for information on trait objects, see <https://doc.rust-lang.org/book/ch17-02-trait-objects.html#using-trait-objects-that-allow-for-values-of-different-types>
27 = help: you could instead create a new `enum` with a variant for each returned type
29 error[E0277]: cannot add `impl Foo` to `u32`
30 --> $DIR/equality.rs:24:11
32 LL | n + sum_to(n - 1)
33 | ^ no implementation for `u32 + impl Foo`
35 = help: the trait `Add<impl Foo>` is not implemented for `u32`
37 error: aborting due to 2 previous errors; 1 warning emitted
39 Some errors have detailed explanations: E0277, E0308.
40 For more information about an error, try `rustc --explain E0277`.