Implement built-in await syntax #60586
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| // edition:2018 | ||
| // aux-build:arc_wake.rs | ||
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| #![feature(async_await, await_macro)] | ||
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| extern crate arc_wake; | ||
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| use std::pin::Pin; | ||
| use std::future::Future; | ||
| use std::sync::{ | ||
| Arc, | ||
| atomic::{self, AtomicUsize}, | ||
| }; | ||
| use std::task::{Context, Poll}; | ||
| use arc_wake::ArcWake; | ||
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| struct Counter { | ||
| wakes: AtomicUsize, | ||
| } | ||
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| impl ArcWake for Counter { | ||
| fn wake(self: Arc<Self>) { | ||
| Self::wake_by_ref(&self) | ||
| } | ||
| fn wake_by_ref(arc_self: &Arc<Self>) { | ||
| arc_self.wakes.fetch_add(1, atomic::Ordering::SeqCst); | ||
| } | ||
| } | ||
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| struct WakeOnceThenComplete(bool); | ||
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| fn wake_and_yield_once() -> WakeOnceThenComplete { WakeOnceThenComplete(false) } | ||
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| impl Future for WakeOnceThenComplete { | ||
| type Output = (); | ||
| fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { | ||
| if self.0 { | ||
| Poll::Ready(()) | ||
| } else { | ||
| cx.waker().wake_by_ref(); | ||
| self.0 = true; | ||
| Poll::Pending | ||
| } | ||
| } | ||
| } | ||
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| fn async_block(x: u8) -> impl Future<Output = u8> { | ||
| async move { | ||
| await!(wake_and_yield_once()); | ||
| x | ||
| } | ||
| } | ||
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| fn async_block_with_borrow_named_lifetime<'a>(x: &'a u8) -> impl Future<Output = u8> + 'a { | ||
| async move { | ||
| await!(wake_and_yield_once()); | ||
| *x | ||
| } | ||
| } | ||
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| fn async_nonmove_block(x: u8) -> impl Future<Output = u8> { | ||
| async move { | ||
| let future = async { | ||
| await!(wake_and_yield_once()); | ||
| x | ||
| }; | ||
| await!(future) | ||
| } | ||
| } | ||
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| fn async_closure(x: u8) -> impl Future<Output = u8> { | ||
| (async move |x: u8| -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| x | ||
| })(x) | ||
| } | ||
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| async fn async_fn(x: u8) -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| x | ||
| } | ||
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| async fn generic_async_fn<T>(x: T) -> T { | ||
| await!(wake_and_yield_once()); | ||
| x | ||
| } | ||
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| async fn async_fn_with_borrow(x: &u8) -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| *x | ||
| } | ||
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| async fn async_fn_with_borrow_named_lifetime<'a>(x: &'a u8) -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| *x | ||
| } | ||
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| fn async_fn_with_impl_future_named_lifetime<'a>(x: &'a u8) -> impl Future<Output = u8> + 'a { | ||
| async move { | ||
| await!(wake_and_yield_once()); | ||
| *x | ||
| } | ||
| } | ||
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| /* FIXME(cramertj) support when `existential type T<'a, 'b>:;` works | ||
| async fn async_fn_multiple_args(x: &u8, _y: &u8) -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| *x | ||
| } | ||
| */ | ||
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| async fn async_fn_multiple_args_named_lifetime<'a>(x: &'a u8, _y: &'a u8) -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| *x | ||
| } | ||
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| fn async_fn_with_internal_borrow(y: u8) -> impl Future<Output = u8> { | ||
| async move { | ||
| await!(async_fn_with_borrow_named_lifetime(&y)) | ||
| } | ||
| } | ||
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| unsafe async fn unsafe_async_fn(x: u8) -> u8 { | ||
| await!(wake_and_yield_once()); | ||
| x | ||
| } | ||
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| struct Foo; | ||
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| trait Bar { | ||
| fn foo() {} | ||
| } | ||
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| impl Foo { | ||
| async fn async_method(x: u8) -> u8 { | ||
| unsafe { | ||
| await!(unsafe_async_fn(x)) | ||
| } | ||
| } | ||
| } | ||
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| fn test_future_yields_once_then_returns<F, Fut>(f: F) | ||
| where | ||
| F: FnOnce(u8) -> Fut, | ||
| Fut: Future<Output = u8>, | ||
| { | ||
| let mut fut = Box::pin(f(9)); | ||
| let counter = Arc::new(Counter { wakes: AtomicUsize::new(0) }); | ||
| let waker = ArcWake::into_waker(counter.clone()); | ||
| let mut cx = Context::from_waker(&waker); | ||
| assert_eq!(0, counter.wakes.load(atomic::Ordering::SeqCst)); | ||
| assert_eq!(Poll::Pending, fut.as_mut().poll(&mut cx)); | ||
| assert_eq!(1, counter.wakes.load(atomic::Ordering::SeqCst)); | ||
| assert_eq!(Poll::Ready(9), fut.as_mut().poll(&mut cx)); | ||
| } | ||
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| fn main() { | ||
| macro_rules! test { | ||
| ($($fn_name:expr,)*) => { $( | ||
| test_future_yields_once_then_returns($fn_name); | ||
| )* } | ||
| } | ||
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| macro_rules! test_with_borrow { | ||
| ($($fn_name:expr,)*) => { $( | ||
| test_future_yields_once_then_returns(|x| { | ||
| async move { | ||
| await!($fn_name(&x)) | ||
| } | ||
| }); | ||
| )* } | ||
| } | ||
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| test! { | ||
| async_block, | ||
| async_nonmove_block, | ||
| async_closure, | ||
| async_fn, | ||
| generic_async_fn, | ||
| async_fn_with_internal_borrow, | ||
| Foo::async_method, | ||
| |x| { | ||
| async move { | ||
| unsafe { await!(unsafe_async_fn(x)) } | ||
| } | ||
| }, | ||
| } | ||
| test_with_borrow! { | ||
| async_block_with_borrow_named_lifetime, | ||
| async_fn_with_borrow, | ||
| async_fn_with_borrow_named_lifetime, | ||
| async_fn_with_impl_future_named_lifetime, | ||
| |x| { | ||
| async move { | ||
| await!(async_fn_multiple_args_named_lifetime(x, x)) | ||
| } | ||
| }, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| #![feature(async_await, await_macro)] | ||
| #![allow(non_camel_case_types)] | ||
| #![deny(keyword_idents)] | ||
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| mod outer_mod { | ||
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| pub mod await { //~ ERROR `await` is a keyword in the 2018 edition | ||
| //~^ WARN this was previously accepted by the compiler | ||
| pub struct await; //~ ERROR `await` is a keyword in the 2018 edition | ||
| //~^ WARN this was previously accepted by the compiler | ||
| } | ||
| } | ||
| use outer_mod::await::await; //~ ERROR `await` is a keyword in the 2018 edition | ||
| //~^ ERROR `await` is a keyword in the 2018 edition | ||
| //~^^ WARN this was previously accepted by the compiler | ||
| //~^^^ WARN this was previously accepted by the compiler | ||
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| struct Foo { await: () } | ||
| //~^ ERROR `await` is a keyword in the 2018 edition | ||
| //~^^ WARN this was previously accepted by the compiler | ||
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| impl Foo { fn await() {} } | ||
| //~^ ERROR `await` is a keyword in the 2018 edition | ||
| //~^^ WARN this was previously accepted by the compiler | ||
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| macro_rules! await { | ||
| //~^ ERROR `await` is a keyword in the 2018 edition | ||
| //~^^ WARN this was previously accepted by the compiler | ||
| () => {} | ||
| } | ||
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| fn main() { | ||
| match await { await => {} } //~ ERROR `await` is a keyword in the 2018 edition | ||
| //~^ ERROR `await` is a keyword in the 2018 edition | ||
| //~^^ WARN this was previously accepted by the compiler | ||
| //~^^^ WARN this was previously accepted by the compiler | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:6:13 | ||
| | | ||
| LL | pub mod await { | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| note: lint level defined here | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:3:9 | ||
| | | ||
| LL | #![deny(keyword_idents)] | ||
| | ^^^^^^^^^^^^^^ | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:8:20 | ||
| | | ||
| LL | pub struct await; | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:12:16 | ||
| | | ||
| LL | use outer_mod::await::await; | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:12:23 | ||
| | | ||
| LL | use outer_mod::await::await; | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:17:14 | ||
| | | ||
| LL | struct Foo { await: () } | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:21:15 | ||
| | | ||
| LL | impl Foo { fn await() {} } | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:25:14 | ||
| | | ||
| LL | macro_rules! await { | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:32:11 | ||
| | | ||
| LL | match await { await => {} } | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
|
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| error: `await` is a keyword in the 2018 edition | ||
| --> $DIR/2015-edition-error-in-non-macro-position.rs:32:19 | ||
| | | ||
| LL | match await { await => {} } | ||
| | ^^^^^ help: you can use a raw identifier to stay compatible: `r#await` | ||
| | | ||
| = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition! | ||
| = note: for more information, see issue #49716 <https://github.com/rust-lang/rust/issues/49716> | ||
|
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| error: aborting due to 9 previous errors | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // edition:2018 | ||
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| #![allow(non_camel_case_types)] | ||
| #![feature(async_await, await_macro)] | ||
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| mod outer_mod { | ||
| pub mod await { //~ ERROR expected identifier, found reserved keyword `await` | ||
| pub struct await; //~ ERROR expected identifier, found reserved keyword `await` | ||
| } | ||
| } | ||
| use self::outer_mod::await::await; //~ ERROR expected identifier, found reserved keyword `await` | ||
| //~^ ERROR expected identifier, found reserved keyword `await` | ||
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| struct Foo { await: () } | ||
| //~^ ERROR expected identifier, found reserved keyword `await` | ||
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| impl Foo { fn await() {} } | ||
| //~^ ERROR expected identifier, found reserved keyword `await` | ||
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| macro_rules! await { | ||
| //~^ ERROR expected identifier, found reserved keyword `await` | ||
| () => {} | ||
| } | ||
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| fn main() { | ||
| match await { await => () } //~ ERROR expected `!`, found `{` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:7:13 | ||
| | | ||
| LL | pub mod await { | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | pub mod r#await { | ||
| | ^^^^^^^ | ||
|
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| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:8:20 | ||
| | | ||
| LL | pub struct await; | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | pub struct r#await; | ||
| | ^^^^^^^ | ||
|
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| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:11:22 | ||
| | | ||
| LL | use self::outer_mod::await::await; | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | use self::outer_mod::r#await::await; | ||
| | ^^^^^^^ | ||
|
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| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:11:29 | ||
| | | ||
| LL | use self::outer_mod::await::await; | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | use self::outer_mod::await::r#await; | ||
| | ^^^^^^^ | ||
|
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| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:14:14 | ||
| | | ||
| LL | struct Foo { await: () } | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | struct Foo { r#await: () } | ||
| | ^^^^^^^ | ||
|
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| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:17:15 | ||
| | | ||
| LL | impl Foo { fn await() {} } | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | impl Foo { fn r#await() {} } | ||
| | ^^^^^^^ | ||
|
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| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:20:14 | ||
| | | ||
| LL | macro_rules! await { | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | macro_rules! r#await { | ||
| | ^^^^^^^ | ||
|
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| error: expected `!`, found `{` | ||
| --> $DIR/2018-edition-error-in-non-macro-position.rs:26:17 | ||
| | | ||
| LL | match await { await => () } | ||
| | ----- ^ expected `!` | ||
| | | | ||
| | while parsing this match expression | ||
|
|
||
| error: aborting due to 8 previous errors | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,38 +1,50 @@ | ||
| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error.rs:5:13 | ||
| | | ||
| LL | pub mod await { | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | pub mod r#await { | ||
| | ^^^^^^^ | ||
|
|
||
| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error.rs:6:20 | ||
| | | ||
| LL | pub struct await; | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | pub struct r#await; | ||
| | ^^^^^^^ | ||
|
|
||
| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error.rs:9:22 | ||
| | | ||
| LL | use self::outer_mod::await::await; | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | use self::outer_mod::r#await::await; | ||
| | ^^^^^^^ | ||
|
|
||
| error: expected identifier, found reserved keyword `await` | ||
| --> $DIR/2018-edition-error.rs:9:29 | ||
| | | ||
| LL | use self::outer_mod::await::await; | ||
| | ^^^^^ expected identifier, found reserved keyword | ||
| help: you can escape reserved keywords to use them as identifiers | ||
| | | ||
| LL | use self::outer_mod::await::r#await; | ||
| | ^^^^^^^ | ||
|
|
||
| error: expected `!`, found `{` | ||
| --> $DIR/2018-edition-error.rs:13:17 | ||
| | | ||
| LL | match await { await => () } | ||
| | ----- ^ expected `!` | ||
| | | | ||
| | while parsing this match expression | ||
|
|
||
| error: aborting due to 5 previous errors | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,8 @@ | ||
| error: expected expression, found `)` | ||
| --> $DIR/post_expansion_error.rs:8:12 | ||
| | | ||
| LL | await!() | ||
| | ^ expected expression | ||
|
|
||
| error: aborting due to previous error | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| // gate-test-await_macro | ||
| // edition:2018 | ||
|
|
||
| #![feature(async_await)] | ||
|
|
||
| async fn bar() {} | ||
|
|
||
| async fn foo() { | ||
| await!(bar()); //~ ERROR `await!(<expr>)` macro syntax is unstable, and will soon be removed | ||
| } | ||
|
|
||
| fn main() {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| error[E0658]: `await!(<expr>)` macro syntax is unstable, and will soon be removed in favor of `<expr>.await` syntax. | ||
| --> $DIR/await-macro.rs:9:5 | ||
| | | ||
| LL | await!(bar()); | ||
| | ^^^^^ | ||
| | | ||
| = note: for more information, see https://github.com/rust-lang/rust/issues/50547 | ||
| = help: add #![feature(await_macro)] to the crate attributes to enable | ||
|
|
||
| error: aborting due to previous error | ||
|
|
||
| For more information about this error, try `rustc --explain E0658`. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| // edition:2018 | ||
| // | ||
| // Tests that the .await syntax can't be used to make a generator | ||
|
|
||
| #![feature(async_await)] | ||
|
|
||
| async fn foo() {} | ||
|
|
||
| fn make_generator() { | ||
| let _gen = || foo.await; //~ ERROR `await` is only allowed inside `async` functions and blocks | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| error[E0728]: `await` is only allowed inside `async` functions and blocks | ||
| --> $DIR/issue-51719.rs:10:19 | ||
| | | ||
| LL | let _gen = || foo.await; | ||
| | ^^^^^^^^^ | ||
|
|
||
| error: aborting due to previous error | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| // edition:2018 | ||
|
|
||
| #![feature(async_await)] | ||
|
|
||
| async fn inc(limit: i64) -> i64 { | ||
| limit + 1 | ||
| } | ||
|
|
||
| fn main() { | ||
| let result = inc(10000); | ||
| let finished = result.await; | ||
| //~^ ERROR `await` is only allowed inside `async` functions and blocks | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| error[E0728]: `await` is only allowed inside `async` functions and blocks | ||
| --> $DIR/issue-51751.rs:11:20 | ||
| | | ||
| LL | let finished = result.await; | ||
| | ^^^^^^^^^^^^ | ||
|
|
||
| error: aborting due to previous error | ||
|
|
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