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warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/equality.rs:1:12
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LL | #![feature(specialization)]
| ^^^^^^^^^^^^^^
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= note: `#[warn(incomplete_features)]` on by default
= note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
= help: consider using `min_specialization` instead, which is more stable and complete
error[E0308]: mismatched types
--> $DIR/equality.rs:15:5
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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: you could instead create a new `enum` with a variant for each returned type
error[E0277]: cannot add `impl Foo` to `u32`
--> $DIR/equality.rs:24:11
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LL | n + sum_to(n - 1)
| ^ no implementation for `u32 + impl Foo`
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= help: the trait `Add<impl Foo>` is not implemented for `u32`
error[E0283]: type annotations needed
--> $DIR/equality.rs:20:22
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LL | fn sum_to(n: u32) -> impl Foo {
| ^^^^^^^^ cannot infer type for type `{integer}`
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= note: multiple `impl`s satisfying `{integer}: ToString` found in the `alloc` crate:
- impl ToString for i8;
- impl ToString for u8;
note: required because of the requirements on the impl of `Foo` for `{integer}`
--> $DIR/equality.rs:5:26
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LL | impl<T: Copy + ToString> Foo for T {}
| ^^^ ^
error: aborting due to 3 previous errors; 1 warning emitted
Some errors have detailed explanations: E0277, E0283, E0308.
For more information about an error, try `rustc --explain E0277`.
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