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Rollup merge of rust-lang#90578 - lcnr:add-test, r=Mark-Simulacrum
add const generics test cc rust-lang#89829 (comment) r? rust-lang/project-const-generics
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---|---|---|
@@ -0,0 +1,26 @@ | ||
warning: conflicting implementations of trait `SadBee` for type `for<'a> fn(&'a ())` | ||
--> $DIR/invariant.rs:14:1 | ||
| | ||
LL | impl SadBee for for<'a> fn(&'a ()) { | ||
| ---------------------------------- first implementation here | ||
... | ||
LL | impl SadBee for fn(&'static ()) { | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a> fn(&'a ())` | ||
| | ||
= note: `#[warn(coherence_leak_check)]` on by default | ||
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! | ||
= note: for more information, see issue #56105 <https://github.com/rust-lang/rust/issues/56105> | ||
= note: this behavior recently changed as a result of a bug fix; see rust-lang/rust#56105 for details | ||
|
||
error[E0308]: mismatched types | ||
--> $DIR/invariant.rs:27:5 | ||
| | ||
LL | v | ||
| ^ one type is more general than the other | ||
| | ||
= note: expected reference `&Foo<fn(&())>` | ||
found reference `&Foo<for<'a> fn(&'a ())>` | ||
|
||
error: aborting due to previous error; 1 warning emitted | ||
|
||
For more information about this error, try `rustc --explain E0308`. |
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#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
use std::marker::PhantomData; | ||
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trait SadBee { | ||
const ASSOC: usize; | ||
} | ||
// fn(&'static ())` is a supertype of `for<'a> fn(&'a ())` while | ||
// we allow two different impls for these types, leading | ||
// to different const eval results. | ||
impl SadBee for for<'a> fn(&'a ()) { | ||
const ASSOC: usize = 0; | ||
} | ||
impl SadBee for fn(&'static ()) { | ||
//~^ WARNING conflicting implementations of trait | ||
//~| WARNING this was previously accepted | ||
const ASSOC: usize = 100; | ||
} | ||
|
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struct Foo<T: SadBee>([u8; <T as SadBee>::ASSOC], PhantomData<T>) | ||
where | ||
[(); <T as SadBee>::ASSOC]: ; | ||
|
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fn covariant( | ||
v: &'static Foo<for<'a> fn(&'a ())> | ||
) -> &'static Foo<fn(&'static ())> { | ||
v //~ ERROR mismatched types | ||
} | ||
|
||
fn main() { | ||
let y = covariant(&Foo([], PhantomData)); | ||
println!("{:?}", y.0); | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,26 @@ | ||
warning: conflicting implementations of trait `SadBee` for type `for<'a> fn(&'a ())` | ||
--> $DIR/invariant.rs:14:1 | ||
| | ||
LL | impl SadBee for for<'a> fn(&'a ()) { | ||
| ---------------------------------- first implementation here | ||
... | ||
LL | impl SadBee for fn(&'static ()) { | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a> fn(&'a ())` | ||
| | ||
= note: `#[warn(coherence_leak_check)]` on by default | ||
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! | ||
= note: for more information, see issue #56105 <https://github.com/rust-lang/rust/issues/56105> | ||
= note: this behavior recently changed as a result of a bug fix; see rust-lang/rust#56105 for details | ||
|
||
error[E0308]: mismatched types | ||
--> $DIR/invariant.rs:27:5 | ||
| | ||
LL | v | ||
| ^ one type is more general than the other | ||
| | ||
= note: expected reference `&'static Foo<fn(&'static ())>` | ||
found reference `&'static Foo<for<'a> fn(&'a ())>` | ||
|
||
error: aborting due to previous error; 1 warning emitted | ||
|
||
For more information about this error, try `rustc --explain E0308`. |