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Original file line number | Diff line number | Diff line change |
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error[E0271]: expected `[async block@$DIR/async.rs:12:17: 12:25]` to be a future that resolves to `i32`, but it resolves to `()` | ||
--> $DIR/async.rs:12:17 | ||
| | ||
LL | needs_async(async {}); | ||
| ----------- ^^^^^^^^ expected `i32`, found `()` | ||
| | | ||
| required by a bound introduced by this call | ||
| | ||
note: required by a bound in `needs_async` | ||
--> $DIR/async.rs:8:31 | ||
| | ||
LL | fn needs_async(_: impl Future<Output = i32>) {} | ||
| ^^^^^^^^^^^^ required by this bound in `needs_async` | ||
|
||
error: aborting due to previous error | ||
|
||
For more information about this error, try `rustc --explain E0271`. |
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@@ -0,0 +1,19 @@ | ||
// compile-flags: -Ztrait-solver=next | ||
// edition: 2021 | ||
// revisions: pass fail | ||
//[pass] check-pass | ||
|
||
use std::future::Future; | ||
|
||
fn needs_async(_: impl Future<Output = i32>) {} | ||
|
||
#[cfg(fail)] | ||
fn main() { | ||
needs_async(async {}); | ||
//[fail]~^ ERROR to be a future that resolves to `i32`, but it resolves to `()` | ||
} | ||
|
||
#[cfg(pass)] | ||
fn main() { | ||
needs_async(async { 1i32 }); | ||
} |
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Original file line number | Diff line number | Diff line change |
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error[E0277]: the trait bound `[generator@$DIR/generator.rs:18:21: 18:23]: Generator<A>` is not satisfied | ||
--> $DIR/generator.rs:18:21 | ||
| | ||
LL | needs_generator(|| { | ||
| _____---------------_^ | ||
| | | | ||
| | required by a bound introduced by this call | ||
LL | | | ||
LL | | | ||
LL | | | ||
LL | | yield (); | ||
LL | | }); | ||
| |_____^ the trait `Generator<A>` is not implemented for `[generator@$DIR/generator.rs:18:21: 18:23]` | ||
| | ||
note: required by a bound in `needs_generator` | ||
--> $DIR/generator.rs:14:28 | ||
| | ||
LL | fn needs_generator(_: impl Generator<A, Yield = B, Return = C>) {} | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `needs_generator` | ||
|
||
error[E0271]: type mismatch resolving `<[generator@$DIR/generator.rs:18:21: 18:23] as Generator<A>>::Yield == B` | ||
--> $DIR/generator.rs:18:21 | ||
| | ||
LL | needs_generator(|| { | ||
| _____---------------_^ | ||
| | | | ||
| | required by a bound introduced by this call | ||
LL | | | ||
LL | | | ||
LL | | | ||
LL | | yield (); | ||
LL | | }); | ||
| |_____^ types differ | ||
| | ||
note: required by a bound in `needs_generator` | ||
--> $DIR/generator.rs:14:41 | ||
| | ||
LL | fn needs_generator(_: impl Generator<A, Yield = B, Return = C>) {} | ||
| ^^^^^^^^^ required by this bound in `needs_generator` | ||
|
||
error[E0271]: type mismatch resolving `<[generator@$DIR/generator.rs:18:21: 18:23] as Generator<A>>::Return == C` | ||
--> $DIR/generator.rs:18:21 | ||
| | ||
LL | needs_generator(|| { | ||
| _____---------------_^ | ||
| | | | ||
| | required by a bound introduced by this call | ||
LL | | | ||
LL | | | ||
LL | | | ||
LL | | yield (); | ||
LL | | }); | ||
| |_____^ types differ | ||
| | ||
note: required by a bound in `needs_generator` | ||
--> $DIR/generator.rs:14:52 | ||
| | ||
LL | fn needs_generator(_: impl Generator<A, Yield = B, Return = C>) {} | ||
| ^^^^^^^^^^ required by this bound in `needs_generator` | ||
|
||
error: aborting due to 3 previous errors | ||
|
||
Some errors have detailed explanations: E0271, E0277. | ||
For more information about an error, try `rustc --explain E0271`. |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,32 @@ | ||
// compile-flags: -Ztrait-solver=next | ||
// edition: 2021 | ||
// revisions: pass fail | ||
//[pass] check-pass | ||
|
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#![feature(generator_trait, generators)] | ||
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use std::ops::Generator; | ||
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struct A; | ||
struct B; | ||
struct C; | ||
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fn needs_generator(_: impl Generator<A, Yield = B, Return = C>) {} | ||
|
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#[cfg(fail)] | ||
fn main() { | ||
needs_generator(|| { | ||
//[fail]~^ ERROR Generator<A>` is not satisfied | ||
//[fail]~| ERROR as Generator<A>>::Yield == B` | ||
//[fail]~| ERROR as Generator<A>>::Return == C` | ||
yield (); | ||
}); | ||
} | ||
|
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#[cfg(pass)] | ||
fn main() { | ||
needs_generator(|_: A| { | ||
let _: A = yield B; | ||
C | ||
}) | ||
} |