| warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes |
| --> $DIR/equality.rs:1:12 |
| | |
| LL | #![feature(specialization)] |
| | ^^^^^^^^^^^^^^ |
| | |
| = note: `#[warn(incomplete_features)]` on by default |
| = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information |
| |
| error[E0308]: mismatched types |
| --> $DIR/equality.rs:15:5 |
| | |
| LL | fn two(x: bool) -> impl Foo { |
| | -------- expected because this return type... |
| LL | if x { |
| LL | return 1_i32; |
| | ----- ...is found to be `i32` here |
| LL | } |
| LL | 0_u32 |
| | ^^^^^ expected `i32`, found `u32` |
| | |
| = note: to return `impl Trait`, all returned values must be of the same type |
| = note: for information on `impl Trait`, see <https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-implement-traits> |
| = help: if the trait `Foo` were object safe, you could return a boxed trait object |
| = 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> |
| = help: alternatively, create a new `enum` with a variant for each returned type |
| |
| error[E0277]: cannot add `impl Foo` to `u32` |
| --> $DIR/equality.rs:24:11 |
| | |
| LL | n + sum_to(n - 1) |
| | ^ no implementation for `u32 + impl Foo` |
| | |
| = help: the trait `std::ops::Add<impl Foo>` is not implemented for `u32` |
| |
| error: aborting due to 2 previous errors; 1 warning emitted |
| |
| Some errors have detailed explanations: E0277, E0308. |
| For more information about an error, try `rustc --explain E0277`. |
