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name async generators something more human friendly in type error dia…
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,16 @@ | ||
// edition:2018 | ||
#![feature(async_closure)] | ||
use std::future::Future; | ||
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||
async fn one() {} | ||
async fn two() {} | ||
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fn fun<F: Future<Output = ()>>(f1: F, f2: F) {} | ||
fn main() { | ||
fun(async {}, async {}); | ||
//~^ ERROR mismatched types | ||
fun(one(), two()); | ||
//~^ ERROR mismatched types | ||
fun((async || {})(), (async || {})()); | ||
//~^ ERROR mismatched types | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,49 @@ | ||
error[E0308]: mismatched types | ||
--> $DIR/generator-desc.rs:10:25 | ||
| | ||
LL | fun(async {}, async {}); | ||
| -- ^^ expected `async` block, found a different `async` block | ||
| | | ||
| the expected `async` block | ||
| | ||
= note: expected `async` block `[static generator@$DIR/generator-desc.rs:10:15: 10:17]` | ||
found `async` block `[static generator@$DIR/generator-desc.rs:10:25: 10:27]` | ||
|
||
error[E0308]: mismatched types | ||
--> $DIR/generator-desc.rs:12:16 | ||
| | ||
LL | async fn one() {} | ||
| - the `Output` of this `async fn`'s expected opaque type | ||
LL | async fn two() {} | ||
| - the `Output` of this `async fn`'s found opaque type | ||
... | ||
LL | fun(one(), two()); | ||
| ^^^^^ expected opaque type, found a different opaque type | ||
| | ||
= note: expected opaque type `impl Future` (opaque type at <$DIR/generator-desc.rs:5:16>) | ||
found opaque type `impl Future` (opaque type at <$DIR/generator-desc.rs:6:16>) | ||
= help: consider `await`ing on both `Future`s | ||
= note: distinct uses of `impl Trait` result in different opaque types | ||
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error[E0308]: mismatched types | ||
--> $DIR/generator-desc.rs:14:26 | ||
| | ||
LL | fun((async || {})(), (async || {})()); | ||
| -- ^^^^^^^^^^^^^^^ expected `async` closure body, found a different `async` closure body | ||
| | | ||
| the expected `async` closure body | ||
| | ||
::: $SRC_DIR/core/src/future/mod.rs:LL:COL | ||
| | ||
LL | pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return> | ||
| ------------------------------- | ||
| | | ||
| the expected opaque type | ||
| the found opaque type | ||
| | ||
= note: expected opaque type `impl Future` (`async` closure body) | ||
found opaque type `impl Future` (`async` closure body) | ||
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error: aborting due to 3 previous errors | ||
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For more information about this error, try `rustc --explain E0308`. |