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rust/tests/mir-opt/building/async_await.b-{closure#0}.generator_resume.0.mir

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Transform async ResumeTy in generator transform - Eliminates all the `get_context` calls that async lowering created. - Replace all `Local` `ResumeTy` types with `&mut Context<'_>`. The `Local`s that have their types replaced are: - The `resume` argument itself. - The argument to `get_context`. - The yielded value of a `yield`. The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`. Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors. See <https://github.com/rust-lang/rust/issues/105501>. The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`.
2022-12-20 08:15:29 -06:00
// MIR for `b::{closure#0}` 0 generator_resume
/* generator_layout = GeneratorLayout {
field_tys: {
_0: impl std::future::Future<Output = ()>,
_1: impl std::future::Future<Output = ()>,
},
variant_fields: {
Unresumed(0): [],
Returned (1): [],
Panicked (2): [],
Suspend0 (3): [_0],
Suspend1 (4): [_1],
},
storage_conflicts: BitMatrix(2x2) {
(_0, _0),
(_1, _1),
},
} */
fn b::{closure#0}(_1: Pin<&mut [async fn body@$DIR/async_await.rs:14:18: 17:2]>, _2: &mut Context<'_>) -> Poll<()> {
debug _task_context => _38; // in scope 0 at $DIR/async_await.rs:+0:18: +3:2
let mut _0: std::task::Poll<()>; // return place in scope 0 at $DIR/async_await.rs:+0:18: +3:2
let _3: (); // in scope 0 at $DIR/async_await.rs:+1:5: +1:14
let mut _4: impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _5: impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+1:5: +1:8
let mut _6: impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _7: (); // in scope 0 at $DIR/async_await.rs:+0:18: +3:2
let _8: (); // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _9: std::task::Poll<()>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _10: std::pin::Pin<&mut impl std::future::Future<Output = ()>>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _11: &mut impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _12: &mut impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _13: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+1:5: +1:14
let mut _14: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+1:5: +1:14
let mut _15: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _16: isize; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _18: !; // in scope 0 at $DIR/async_await.rs:+1:5: +1:14
let mut _19: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _20: (); // in scope 0 at $DIR/async_await.rs:+1:8: +1:14
let mut _21: impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _22: impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+2:5: +2:8
let mut _23: impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let _24: (); // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _25: std::task::Poll<()>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _26: std::pin::Pin<&mut impl std::future::Future<Output = ()>>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _27: &mut impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _28: &mut impl std::future::Future<Output = ()>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _29: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+2:5: +2:14
let mut _30: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+2:5: +2:14
let mut _31: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _32: isize; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _34: !; // in scope 0 at $DIR/async_await.rs:+2:5: +2:14
let mut _35: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _36: (); // in scope 0 at $DIR/async_await.rs:+2:8: +2:14
let mut _37: (); // in scope 0 at $DIR/async_await.rs:+0:18: +3:2
let mut _38: &mut std::task::Context<'_>; // in scope 0 at $DIR/async_await.rs:+0:18: +3:2
let mut _39: u32; // in scope 0 at $DIR/async_await.rs:+0:18: +3:2
scope 1 {
debug __awaitee => (((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2])) as variant#3).0: impl std::future::Future<Output = ()>); // in scope 1 at $DIR/async_await.rs:+1:8: +1:14
let _17: (); // in scope 1 at $DIR/async_await.rs:+1:5: +1:14
scope 2 {
}
scope 3 {
debug result => _17; // in scope 3 at $DIR/async_await.rs:+1:5: +1:14
}
}
scope 4 {
debug __awaitee => (((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2])) as variant#4).0: impl std::future::Future<Output = ()>); // in scope 4 at $DIR/async_await.rs:+2:8: +2:14
let _33: (); // in scope 4 at $DIR/async_await.rs:+2:5: +2:14
scope 5 {
}
scope 6 {
debug result => _33; // in scope 6 at $DIR/async_await.rs:+2:5: +2:14
}
}
bb0: {
_39 = discriminant((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2]))); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
switchInt(move _39) -> [0: bb1, 1: bb29, 3: bb27, 4: bb28, otherwise: bb30]; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
}
bb1: {
_38 = move _2; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
StorageLive(_3); // scope 0 at $DIR/async_await.rs:+1:5: +1:14
StorageLive(_4); // scope 0 at $DIR/async_await.rs:+1:8: +1:14
StorageLive(_5); // scope 0 at $DIR/async_await.rs:+1:5: +1:8
_5 = a() -> bb2; // scope 0 at $DIR/async_await.rs:+1:5: +1:8
// mir::Constant
// + span: $DIR/async_await.rs:15:5: 15:6
// + literal: Const { ty: fn() -> impl Future<Output = ()> {a}, val: Value(<ZST>) }
}
bb2: {
_4 = <impl Future<Output = ()> as IntoFuture>::into_future(move _5) -> bb3; // scope 0 at $DIR/async_await.rs:+1:8: +1:14
// mir::Constant
// + span: $DIR/async_await.rs:15:8: 15:14
// + literal: Const { ty: fn(impl Future<Output = ()>) -> <impl Future<Output = ()> as IntoFuture>::IntoFuture {<impl Future<Output = ()> as IntoFuture>::into_future}, val: Value(<ZST>) }
}
bb3: {
StorageDead(_5); // scope 0 at $DIR/async_await.rs:+1:13: +1:14
nop; // scope 0 at $DIR/async_await.rs:+1:8: +1:14
(((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2])) as variant#3).0: impl std::future::Future<Output = ()>) = move _4; // scope 0 at $DIR/async_await.rs:+1:8: +1:14
goto -> bb4; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
}
bb4: {
StorageLive(_8); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
StorageLive(_9); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
StorageLive(_10); // scope 2 at $DIR/async_await.rs:+1:8: +1:14
StorageLive(_11); // scope 2 at $DIR/async_await.rs:+1:8: +1:14
StorageLive(_12); // scope 2 at $DIR/async_await.rs:+1:8: +1:14
_12 = &mut (((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2])) as variant#3).0: impl std::future::Future<Output = ()>); // scope 2 at $DIR/async_await.rs:+1:8: +1:14
_11 = &mut (*_12); // scope 2 at $DIR/async_await.rs:+1:8: +1:14
_10 = Pin::<&mut impl Future<Output = ()>>::new_unchecked(move _11) -> bb5; // scope 2 at $DIR/async_await.rs:+1:8: +1:14
// mir::Constant
// + span: $DIR/async_await.rs:15:8: 15:14
// + literal: Const { ty: unsafe fn(&mut impl Future<Output = ()>) -> Pin<&mut impl Future<Output = ()>> {Pin::<&mut impl Future<Output = ()>>::new_unchecked}, val: Value(<ZST>) }
}
bb5: {
StorageDead(_11); // scope 2 at $DIR/async_await.rs:+1:13: +1:14
StorageLive(_13); // scope 2 at $DIR/async_await.rs:+1:5: +1:14
StorageLive(_14); // scope 2 at $DIR/async_await.rs:+1:5: +1:14
StorageLive(_15); // scope 2 at $DIR/async_await.rs:+1:8: +1:14
_15 = _38; // scope 2 at $DIR/async_await.rs:+1:8: +1:14
_14 = move _15; // scope 2 at $DIR/async_await.rs:+1:5: +1:14
goto -> bb6; // scope 2 at $DIR/async_await.rs:+1:5: +1:14
}
bb6: {
_13 = &mut (*_14); // scope 2 at $DIR/async_await.rs:+1:5: +1:14
StorageDead(_15); // scope 2 at $DIR/async_await.rs:+1:13: +1:14
_9 = <impl Future<Output = ()> as Future>::poll(move _10, move _13) -> bb7; // scope 2 at $DIR/async_await.rs:+1:8: +1:14
// mir::Constant
// + span: $DIR/async_await.rs:15:8: 15:14
// + literal: Const { ty: for<'a, 'b, 'c> fn(Pin<&'a mut impl Future<Output = ()>>, &'b mut Context<'c>) -> Poll<<impl Future<Output = ()> as Future>::Output> {<impl Future<Output = ()> as Future>::poll}, val: Value(<ZST>) }
}
bb7: {
StorageDead(_13); // scope 2 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_10); // scope 2 at $DIR/async_await.rs:+1:13: +1:14
_16 = discriminant(_9); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
switchInt(move _16) -> [0: bb10, 1: bb8, otherwise: bb9]; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
}
bb8: {
_8 = const (); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
StorageDead(_14); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_12); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_9); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_8); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageLive(_19); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
StorageLive(_20); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
_20 = (); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
Deinit(_0); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
discriminant(_0) = 1; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
discriminant((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2]))) = 3; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
return; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
}
bb9: {
unreachable; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
}
bb10: {
StorageLive(_17); // scope 1 at $DIR/async_await.rs:+1:5: +1:14
_17 = ((_9 as Ready).0: ()); // scope 1 at $DIR/async_await.rs:+1:5: +1:14
_3 = _17; // scope 3 at $DIR/async_await.rs:+1:5: +1:14
StorageDead(_17); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_14); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_12); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_9); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
StorageDead(_8); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
goto -> bb12; // scope 0 at $DIR/async_await.rs:+1:13: +1:14
}
bb11: {
StorageDead(_20); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
_38 = move _19; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
StorageDead(_19); // scope 1 at $DIR/async_await.rs:+1:13: +1:14
_7 = const (); // scope 1 at $DIR/async_await.rs:+1:8: +1:14
goto -> bb4; // scope 1 at $DIR/async_await.rs:+1:8: +1:14
}
bb12: {
nop; // scope 0 at $DIR/async_await.rs:+1:13: +1:14
goto -> bb13; // scope 0 at $DIR/async_await.rs:+1:14: +1:15
}
bb13: {
StorageDead(_4); // scope 0 at $DIR/async_await.rs:+1:14: +1:15
StorageDead(_3); // scope 0 at $DIR/async_await.rs:+1:14: +1:15
StorageLive(_21); // scope 0 at $DIR/async_await.rs:+2:8: +2:14
StorageLive(_22); // scope 0 at $DIR/async_await.rs:+2:5: +2:8
_22 = a() -> bb14; // scope 0 at $DIR/async_await.rs:+2:5: +2:8
// mir::Constant
// + span: $DIR/async_await.rs:16:5: 16:6
// + literal: Const { ty: fn() -> impl Future<Output = ()> {a}, val: Value(<ZST>) }
}
bb14: {
_21 = <impl Future<Output = ()> as IntoFuture>::into_future(move _22) -> bb15; // scope 0 at $DIR/async_await.rs:+2:8: +2:14
// mir::Constant
// + span: $DIR/async_await.rs:16:8: 16:14
// + literal: Const { ty: fn(impl Future<Output = ()>) -> <impl Future<Output = ()> as IntoFuture>::IntoFuture {<impl Future<Output = ()> as IntoFuture>::into_future}, val: Value(<ZST>) }
}
bb15: {
StorageDead(_22); // scope 0 at $DIR/async_await.rs:+2:13: +2:14
nop; // scope 0 at $DIR/async_await.rs:+2:8: +2:14
(((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2])) as variant#4).0: impl std::future::Future<Output = ()>) = move _21; // scope 0 at $DIR/async_await.rs:+2:8: +2:14
goto -> bb16; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
}
bb16: {
StorageLive(_24); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
StorageLive(_25); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
StorageLive(_26); // scope 5 at $DIR/async_await.rs:+2:8: +2:14
StorageLive(_27); // scope 5 at $DIR/async_await.rs:+2:8: +2:14
StorageLive(_28); // scope 5 at $DIR/async_await.rs:+2:8: +2:14
_28 = &mut (((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2])) as variant#4).0: impl std::future::Future<Output = ()>); // scope 5 at $DIR/async_await.rs:+2:8: +2:14
_27 = &mut (*_28); // scope 5 at $DIR/async_await.rs:+2:8: +2:14
_26 = Pin::<&mut impl Future<Output = ()>>::new_unchecked(move _27) -> bb17; // scope 5 at $DIR/async_await.rs:+2:8: +2:14
// mir::Constant
// + span: $DIR/async_await.rs:16:8: 16:14
// + literal: Const { ty: unsafe fn(&mut impl Future<Output = ()>) -> Pin<&mut impl Future<Output = ()>> {Pin::<&mut impl Future<Output = ()>>::new_unchecked}, val: Value(<ZST>) }
}
bb17: {
StorageDead(_27); // scope 5 at $DIR/async_await.rs:+2:13: +2:14
StorageLive(_29); // scope 5 at $DIR/async_await.rs:+2:5: +2:14
StorageLive(_30); // scope 5 at $DIR/async_await.rs:+2:5: +2:14
StorageLive(_31); // scope 5 at $DIR/async_await.rs:+2:8: +2:14
_31 = _38; // scope 5 at $DIR/async_await.rs:+2:8: +2:14
_30 = move _31; // scope 5 at $DIR/async_await.rs:+2:5: +2:14
goto -> bb18; // scope 5 at $DIR/async_await.rs:+2:5: +2:14
}
bb18: {
_29 = &mut (*_30); // scope 5 at $DIR/async_await.rs:+2:5: +2:14
StorageDead(_31); // scope 5 at $DIR/async_await.rs:+2:13: +2:14
_25 = <impl Future<Output = ()> as Future>::poll(move _26, move _29) -> bb19; // scope 5 at $DIR/async_await.rs:+2:8: +2:14
// mir::Constant
// + span: $DIR/async_await.rs:16:8: 16:14
// + literal: Const { ty: for<'a, 'b, 'c> fn(Pin<&'a mut impl Future<Output = ()>>, &'b mut Context<'c>) -> Poll<<impl Future<Output = ()> as Future>::Output> {<impl Future<Output = ()> as Future>::poll}, val: Value(<ZST>) }
}
bb19: {
StorageDead(_29); // scope 5 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_26); // scope 5 at $DIR/async_await.rs:+2:13: +2:14
_32 = discriminant(_25); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
switchInt(move _32) -> [0: bb22, 1: bb20, otherwise: bb21]; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
}
bb20: {
_24 = const (); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
StorageDead(_30); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_28); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_25); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_24); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageLive(_35); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
StorageLive(_36); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
_36 = (); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
Deinit(_0); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
discriminant(_0) = 1; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
discriminant((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2]))) = 4; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
return; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
}
bb21: {
unreachable; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
}
bb22: {
StorageLive(_33); // scope 4 at $DIR/async_await.rs:+2:5: +2:14
_33 = ((_25 as Ready).0: ()); // scope 4 at $DIR/async_await.rs:+2:5: +2:14
_37 = _33; // scope 6 at $DIR/async_await.rs:+2:5: +2:14
StorageDead(_33); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_30); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_28); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_25); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
StorageDead(_24); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
goto -> bb24; // scope 0 at $DIR/async_await.rs:+2:13: +2:14
}
bb23: {
StorageDead(_36); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
_38 = move _35; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
StorageDead(_35); // scope 4 at $DIR/async_await.rs:+2:13: +2:14
_7 = const (); // scope 4 at $DIR/async_await.rs:+2:8: +2:14
goto -> bb16; // scope 4 at $DIR/async_await.rs:+2:8: +2:14
}
bb24: {
nop; // scope 0 at $DIR/async_await.rs:+2:13: +2:14
goto -> bb25; // scope 0 at $DIR/async_await.rs:+3:1: +3:2
}
bb25: {
StorageDead(_21); // scope 0 at $DIR/async_await.rs:+3:1: +3:2
goto -> bb26; // scope 0 at $DIR/async_await.rs:+3:1: +3:2
}
bb26: {
Deinit(_0); // scope 0 at $DIR/async_await.rs:+3:2: +3:2
((_0 as Ready).0: ()) = move _37; // scope 0 at $DIR/async_await.rs:+3:2: +3:2
discriminant(_0) = 0; // scope 0 at $DIR/async_await.rs:+3:2: +3:2
discriminant((*(_1.0: &mut [async fn body@$DIR/async_await.rs:14:18: 17:2]))) = 1; // scope 0 at $DIR/async_await.rs:+3:2: +3:2
return; // scope 0 at $DIR/async_await.rs:+3:2: +3:2
}
bb27: {
StorageLive(_3); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
StorageLive(_4); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
StorageLive(_19); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
StorageLive(_20); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
_19 = move _2; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
goto -> bb11; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
}
bb28: {
StorageLive(_21); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
StorageLive(_35); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
StorageLive(_36); // scope 0 at $DIR/async_await.rs:+0:18: +3:2
_35 = move _2; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
goto -> bb23; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
}
bb29: {
assert(const false, "`async fn` resumed after completion") -> bb29; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
}
bb30: {
unreachable; // scope 0 at $DIR/async_await.rs:+0:18: +3:2
}
}
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