| #![warn(rust_2018_idioms, single_use_lifetimes)] |
| #![allow(dead_code)] |
| |
| #[macro_use] |
| mod auxiliary; |
| |
| use std::{ |
| marker::{PhantomData, PhantomPinned}, |
| panic, |
| pin::Pin, |
| }; |
| |
| use pin_project::{pin_project, pinned_drop, UnsafeUnpin}; |
| |
| #[test] |
| fn projection() { |
| #[pin_project( |
| project = StructProj, |
| project_ref = StructProjRef, |
| project_replace = StructProjOwn, |
| )] |
| struct Struct<T, U> { |
| #[pin] |
| f1: T, |
| f2: U, |
| } |
| |
| let mut s = Struct { f1: 1, f2: 2 }; |
| let mut s_orig = Pin::new(&mut s); |
| let s = s_orig.as_mut().project(); |
| |
| let _: Pin<&mut i32> = s.f1; |
| assert_eq!(*s.f1, 1); |
| let _: &mut i32 = s.f2; |
| assert_eq!(*s.f2, 2); |
| |
| assert_eq!(s_orig.as_ref().f1, 1); |
| assert_eq!(s_orig.as_ref().f2, 2); |
| |
| let mut s = Struct { f1: 1, f2: 2 }; |
| let mut s = Pin::new(&mut s); |
| { |
| let StructProj { f1, f2 } = s.as_mut().project(); |
| let _: Pin<&mut i32> = f1; |
| let _: &mut i32 = f2; |
| } |
| { |
| let StructProjRef { f1, f2 } = s.as_ref().project_ref(); |
| let _: Pin<&i32> = f1; |
| let _: &i32 = f2; |
| } |
| { |
| let StructProjOwn { f1, f2 } = s.as_mut().project_replace(Struct { f1: 3, f2: 4 }); |
| let _: PhantomData<i32> = f1; |
| let _: i32 = f2; |
| assert_eq!(f2, 2); |
| assert_eq!(s.f1, 3); |
| assert_eq!(s.f2, 4); |
| } |
| |
| #[pin_project(project_replace)] |
| struct TupleStruct<T, U>(#[pin] T, U); |
| |
| let mut s = TupleStruct(1, 2); |
| let s = Pin::new(&mut s).project(); |
| |
| let _: Pin<&mut i32> = s.0; |
| assert_eq!(*s.0, 1); |
| let _: &mut i32 = s.1; |
| assert_eq!(*s.1, 2); |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| #[derive(Eq, PartialEq, Debug)] |
| enum Enum<A, B, C, D> { |
| Tuple(#[pin] A, B), |
| Struct { |
| #[pin] |
| f1: C, |
| f2: D, |
| }, |
| Unit, |
| } |
| |
| let mut e = Enum::Tuple(1, 2); |
| let mut e = Pin::new(&mut e); |
| |
| match e.as_mut().project() { |
| EnumProj::Tuple(x, y) => { |
| let x: Pin<&mut i32> = x; |
| assert_eq!(*x, 1); |
| let y: &mut i32 = y; |
| assert_eq!(*y, 2); |
| } |
| EnumProj::Struct { f1, f2 } => { |
| let _: Pin<&mut i32> = f1; |
| let _: &mut i32 = f2; |
| unreachable!(); |
| } |
| EnumProj::Unit => unreachable!(), |
| } |
| |
| assert_eq!(&*e, &Enum::Tuple(1, 2)); |
| |
| let mut e = Enum::Struct { f1: 3, f2: 4 }; |
| let mut e = Pin::new(&mut e); |
| |
| match e.as_mut().project() { |
| EnumProj::Tuple(x, y) => { |
| let _: Pin<&mut i32> = x; |
| let _: &mut i32 = y; |
| unreachable!(); |
| } |
| EnumProj::Struct { f1, f2 } => { |
| let _: Pin<&mut i32> = f1; |
| assert_eq!(*f1, 3); |
| let _: &mut i32 = f2; |
| assert_eq!(*f2, 4); |
| } |
| EnumProj::Unit => unreachable!(), |
| } |
| |
| if let EnumProj::Struct { f1, f2 } = e.as_mut().project() { |
| let _: Pin<&mut i32> = f1; |
| assert_eq!(*f1, 3); |
| let _: &mut i32 = f2; |
| assert_eq!(*f2, 4); |
| } |
| } |
| |
| #[test] |
| fn enum_project_set() { |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| #[derive(Eq, PartialEq, Debug)] |
| enum Enum { |
| V1(#[pin] u8), |
| V2(bool), |
| } |
| |
| let mut e = Enum::V1(25); |
| let mut e_orig = Pin::new(&mut e); |
| let e_proj = e_orig.as_mut().project(); |
| |
| match e_proj { |
| EnumProj::V1(val) => { |
| let new_e = Enum::V2(val.as_ref().get_ref() == &25); |
| e_orig.set(new_e); |
| } |
| EnumProj::V2(_) => unreachable!(), |
| } |
| |
| assert_eq!(e, Enum::V2(true)); |
| } |
| |
| #[test] |
| fn where_clause() { |
| #[pin_project] |
| struct Struct<T> |
| where |
| T: Copy, |
| { |
| f: T, |
| } |
| |
| #[pin_project] |
| struct TupleStruct<T>(T) |
| where |
| T: Copy; |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| enum Enum<T> |
| where |
| T: Copy, |
| { |
| V(T), |
| } |
| } |
| |
| #[test] |
| fn where_clause_and_associated_type_field() { |
| #[pin_project(project_replace)] |
| struct Struct1<I> |
| where |
| I: Iterator, |
| { |
| #[pin] |
| f1: I, |
| f2: I::Item, |
| } |
| |
| #[pin_project(project_replace)] |
| struct Struct2<I, J> |
| where |
| I: Iterator<Item = J>, |
| { |
| #[pin] |
| f1: I, |
| f2: J, |
| } |
| |
| #[pin_project(project_replace)] |
| struct Struct3<T> |
| where |
| T: 'static, |
| { |
| f: T, |
| } |
| |
| trait Static: 'static {} |
| |
| impl<T> Static for Struct3<T> {} |
| |
| #[pin_project(project_replace)] |
| struct TupleStruct<I>(#[pin] I, I::Item) |
| where |
| I: Iterator; |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| enum Enum<I> |
| where |
| I: Iterator, |
| { |
| V1(#[pin] I), |
| V2(I::Item), |
| } |
| } |
| |
| #[test] |
| fn derive_copy() { |
| #[pin_project(project_replace)] |
| #[derive(Clone, Copy)] |
| struct Struct<T> { |
| f: T, |
| } |
| |
| fn is_copy<T: Copy>() {} |
| |
| is_copy::<Struct<u8>>(); |
| } |
| |
| #[test] |
| fn move_out() { |
| struct NotCopy; |
| |
| #[pin_project(project_replace)] |
| struct Struct { |
| f: NotCopy, |
| } |
| |
| let x = Struct { f: NotCopy }; |
| let _val: NotCopy = x.f; |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| enum Enum { |
| V(NotCopy), |
| } |
| |
| let x = Enum::V(NotCopy); |
| #[allow(clippy::infallible_destructuring_match)] |
| let _val: NotCopy = match x { |
| Enum::V(val) => val, |
| }; |
| } |
| |
| #[test] |
| fn trait_bounds_on_type_generics() { |
| #[pin_project(project_replace)] |
| pub struct Struct1<'a, T: ?Sized> { |
| f: &'a mut T, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct2<'a, T: ::core::fmt::Debug> { |
| f: &'a mut T, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct3<'a, T: core::fmt::Debug> { |
| f: &'a mut T, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct4<'a, T: core::fmt::Debug + core::fmt::Display> { |
| f: &'a mut T, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct5<'a, T: core::fmt::Debug + ?Sized> { |
| f: &'a mut T, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct6<'a, T: core::fmt::Debug = [u8; 16]> { |
| f: &'a mut T, |
| } |
| |
| let _: Struct6<'_> = Struct6 { f: &mut [0_u8; 16] }; |
| |
| #[pin_project(project_replace)] |
| pub struct Struct7<T: 'static> { |
| f: T, |
| } |
| |
| trait Static: 'static {} |
| |
| impl<T> Static for Struct7<T> {} |
| |
| #[pin_project(project_replace)] |
| pub struct Struct8<'a, 'b: 'a> { |
| f1: &'a u8, |
| f2: &'b u8, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct TupleStruct<'a, T: ?Sized>(&'a mut T); |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| enum Enum<'a, T: ?Sized> { |
| V(&'a mut T), |
| } |
| } |
| |
| #[test] |
| fn overlapping_lifetime_names() { |
| #[pin_project(project_replace)] |
| pub struct Struct1<'pin, T> { |
| #[pin] |
| f: &'pin mut T, |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct2<'pin, 'pin_, 'pin__> { |
| #[pin] |
| f: &'pin &'pin_ &'pin__ (), |
| } |
| |
| pub trait Trait<'a> {} |
| |
| #[allow(single_use_lifetimes)] // https://github.com/rust-lang/rust/issues/55058 |
| #[pin_project(project_replace)] |
| pub struct Hrtb<'pin___, T> |
| where |
| for<'pin> &'pin T: Unpin, |
| T: for<'pin> Trait<'pin>, |
| for<'pin, 'pin_, 'pin__> &'pin &'pin_ &'pin__ T: Unpin, |
| { |
| #[pin] |
| f: &'pin___ mut T, |
| } |
| |
| #[pin_project(PinnedDrop)] |
| pub struct PinnedDropStruct<'pin> { |
| #[pin] |
| f: &'pin (), |
| } |
| |
| #[pinned_drop] |
| impl PinnedDrop for PinnedDropStruct<'_> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| #[pin_project(UnsafeUnpin)] |
| pub struct UnsafeUnpinStruct<'pin> { |
| #[pin] |
| f: &'pin (), |
| } |
| |
| unsafe impl UnsafeUnpin for UnsafeUnpinStruct<'_> {} |
| |
| #[pin_project(!Unpin)] |
| pub struct NotUnpinStruct<'pin> { |
| #[pin] |
| f: &'pin (), |
| } |
| } |
| |
| #[test] |
| fn combine() { |
| #[pin_project(PinnedDrop, UnsafeUnpin)] |
| pub struct PinnedDropWithUnsafeUnpin<T> { |
| #[pin] |
| f: T, |
| } |
| |
| #[pinned_drop] |
| impl<T> PinnedDrop for PinnedDropWithUnsafeUnpin<T> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| unsafe impl<T: Unpin> UnsafeUnpin for PinnedDropWithUnsafeUnpin<T> {} |
| |
| #[pin_project(PinnedDrop, !Unpin)] |
| pub struct PinnedDropWithNotUnpin<T> { |
| #[pin] |
| f: T, |
| } |
| |
| #[pinned_drop] |
| impl<T> PinnedDrop for PinnedDropWithNotUnpin<T> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| #[pin_project(UnsafeUnpin, project_replace)] |
| pub struct UnsafeUnpinWithReplace<T> { |
| #[pin] |
| f: T, |
| } |
| |
| unsafe impl<T: Unpin> UnsafeUnpin for UnsafeUnpinWithReplace<T> {} |
| |
| #[pin_project(!Unpin, project_replace)] |
| pub struct NotUnpinWithReplace<T> { |
| #[pin] |
| f: T, |
| } |
| } |
| |
| #[test] |
| fn private_type_in_public_type() { |
| #[pin_project(project_replace)] |
| pub struct PublicStruct<T> { |
| #[pin] |
| inner: PrivateStruct<T>, |
| } |
| |
| struct PrivateStruct<T>(T); |
| } |
| |
| #[allow(clippy::needless_lifetimes)] |
| #[test] |
| fn lifetime_project() { |
| #[pin_project(project_replace)] |
| struct Struct1<T, U> { |
| #[pin] |
| pinned: T, |
| unpinned: U, |
| } |
| |
| #[pin_project(project_replace)] |
| struct Struct2<'a, T, U> { |
| #[pin] |
| pinned: &'a T, |
| unpinned: U, |
| } |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| enum Enum<T, U> { |
| V { |
| #[pin] |
| pinned: T, |
| unpinned: U, |
| }, |
| } |
| |
| impl<T, U> Struct1<T, U> { |
| fn get_pin_ref<'a>(self: Pin<&'a Self>) -> Pin<&'a T> { |
| self.project_ref().pinned |
| } |
| fn get_pin_mut<'a>(self: Pin<&'a mut Self>) -> Pin<&'a mut T> { |
| self.project().pinned |
| } |
| fn get_pin_ref_elided(self: Pin<&Self>) -> Pin<&T> { |
| self.project_ref().pinned |
| } |
| fn get_pin_mut_elided(self: Pin<&mut Self>) -> Pin<&mut T> { |
| self.project().pinned |
| } |
| } |
| |
| impl<'b, T, U> Struct2<'b, T, U> { |
| fn get_pin_ref<'a>(self: Pin<&'a Self>) -> Pin<&'a &'b T> { |
| self.project_ref().pinned |
| } |
| fn get_pin_mut<'a>(self: Pin<&'a mut Self>) -> Pin<&'a mut &'b T> { |
| self.project().pinned |
| } |
| fn get_pin_ref_elided(self: Pin<&Self>) -> Pin<&&'b T> { |
| self.project_ref().pinned |
| } |
| fn get_pin_mut_elided(self: Pin<&mut Self>) -> Pin<&mut &'b T> { |
| self.project().pinned |
| } |
| } |
| |
| impl<T, U> Enum<T, U> { |
| fn get_pin_ref<'a>(self: Pin<&'a Self>) -> Pin<&'a T> { |
| match self.project_ref() { |
| EnumProjRef::V { pinned, .. } => pinned, |
| } |
| } |
| fn get_pin_mut<'a>(self: Pin<&'a mut Self>) -> Pin<&'a mut T> { |
| match self.project() { |
| EnumProj::V { pinned, .. } => pinned, |
| } |
| } |
| fn get_pin_ref_elided(self: Pin<&Self>) -> Pin<&T> { |
| match self.project_ref() { |
| EnumProjRef::V { pinned, .. } => pinned, |
| } |
| } |
| fn get_pin_mut_elided(self: Pin<&mut Self>) -> Pin<&mut T> { |
| match self.project() { |
| EnumProj::V { pinned, .. } => pinned, |
| } |
| } |
| } |
| } |
| |
| mod visibility { |
| use pin_project::pin_project; |
| |
| #[pin_project(project_replace)] |
| pub(crate) struct S { |
| pub f: u8, |
| } |
| } |
| |
| #[test] |
| fn visibility() { |
| let mut x = visibility::S { f: 0 }; |
| let x = Pin::new(&mut x); |
| let y = x.as_ref().project_ref(); |
| let _: &u8 = y.f; |
| let y = x.project(); |
| let _: &mut u8 = y.f; |
| } |
| |
| #[test] |
| fn trivial_bounds() { |
| #[pin_project(project_replace)] |
| pub struct NoGenerics { |
| #[pin] |
| f: PhantomPinned, |
| } |
| |
| assert_not_unpin!(NoGenerics); |
| } |
| |
| #[test] |
| fn dst() { |
| #[pin_project] |
| struct Struct1<T: ?Sized> { |
| f: T, |
| } |
| |
| let mut x = Struct1 { f: 0_u8 }; |
| let x: Pin<&mut Struct1<dyn core::fmt::Debug>> = Pin::new(&mut x as _); |
| let _: &mut (dyn core::fmt::Debug) = x.project().f; |
| |
| #[pin_project] |
| struct Struct2<T: ?Sized> { |
| #[pin] |
| f: T, |
| } |
| |
| let mut x = Struct2 { f: 0_u8 }; |
| let x: Pin<&mut Struct2<dyn core::fmt::Debug + Unpin>> = Pin::new(&mut x as _); |
| let _: Pin<&mut (dyn core::fmt::Debug + Unpin)> = x.project().f; |
| |
| #[allow(explicit_outlives_requirements)] // https://github.com/rust-lang/rust/issues/60993 |
| #[pin_project] |
| struct Struct3<T> |
| where |
| T: ?Sized, |
| { |
| f: T, |
| } |
| |
| #[allow(explicit_outlives_requirements)] // https://github.com/rust-lang/rust/issues/60993 |
| #[pin_project] |
| struct Struct4<T> |
| where |
| T: ?Sized, |
| { |
| #[pin] |
| f: T, |
| } |
| |
| #[pin_project(UnsafeUnpin)] |
| struct Struct5<T: ?Sized> { |
| f: T, |
| } |
| |
| #[pin_project(UnsafeUnpin)] |
| struct Struct6<T: ?Sized> { |
| #[pin] |
| f: T, |
| } |
| |
| #[pin_project(PinnedDrop)] |
| struct Struct7<T: ?Sized> { |
| f: T, |
| } |
| |
| #[pinned_drop] |
| impl<T: ?Sized> PinnedDrop for Struct7<T> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| #[pin_project(PinnedDrop)] |
| struct Struct8<T: ?Sized> { |
| #[pin] |
| f: T, |
| } |
| |
| #[pinned_drop] |
| impl<T: ?Sized> PinnedDrop for Struct8<T> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| #[pin_project(!Unpin)] |
| struct Struct9<T: ?Sized> { |
| f: T, |
| } |
| |
| #[pin_project(!Unpin)] |
| struct Struct10<T: ?Sized> { |
| #[pin] |
| f: T, |
| } |
| |
| #[pin_project] |
| struct Struct11<'a, T: ?Sized, U: ?Sized> { |
| f1: &'a mut T, |
| f2: U, |
| } |
| |
| #[pin_project] |
| struct TupleStruct1<T: ?Sized>(T); |
| |
| #[pin_project] |
| struct TupleStruct2<T: ?Sized>(#[pin] T); |
| |
| #[allow(explicit_outlives_requirements)] // https://github.com/rust-lang/rust/issues/60993 |
| #[pin_project] |
| struct TupleStruct3<T>(T) |
| where |
| T: ?Sized; |
| |
| #[allow(explicit_outlives_requirements)] // https://github.com/rust-lang/rust/issues/60993 |
| #[pin_project] |
| struct TupleStruct4<T>(#[pin] T) |
| where |
| T: ?Sized; |
| |
| #[pin_project(UnsafeUnpin)] |
| struct TupleStruct5<T: ?Sized>(T); |
| |
| #[pin_project(UnsafeUnpin)] |
| struct TupleStruct6<T: ?Sized>(#[pin] T); |
| |
| #[pin_project(PinnedDrop)] |
| struct TupleStruct7<T: ?Sized>(T); |
| |
| #[pinned_drop] |
| impl<T: ?Sized> PinnedDrop for TupleStruct7<T> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| #[pin_project(PinnedDrop)] |
| struct TupleStruct8<T: ?Sized>(#[pin] T); |
| |
| #[pinned_drop] |
| impl<T: ?Sized> PinnedDrop for TupleStruct8<T> { |
| fn drop(self: Pin<&mut Self>) {} |
| } |
| |
| #[pin_project(!Unpin)] |
| struct TupleStruct9<T: ?Sized>(T); |
| |
| #[pin_project(!Unpin)] |
| struct TupleStruct10<T: ?Sized>(#[pin] T); |
| |
| #[pin_project] |
| struct TupleStruct11<'a, T: ?Sized, U: ?Sized>(&'a mut T, U); |
| } |
| |
| #[test] |
| fn dyn_type() { |
| #[pin_project] |
| struct Struct1 { |
| f: dyn core::fmt::Debug, |
| } |
| |
| #[pin_project] |
| struct Struct2 { |
| #[pin] |
| f: dyn core::fmt::Debug, |
| } |
| |
| #[pin_project] |
| struct Struct3 { |
| f: dyn core::fmt::Debug + Send, |
| } |
| |
| #[pin_project] |
| struct Struct4 { |
| #[pin] |
| f: dyn core::fmt::Debug + Send, |
| } |
| |
| #[pin_project] |
| struct TupleStruct1(dyn core::fmt::Debug); |
| |
| #[pin_project] |
| struct TupleStruct2(#[pin] dyn core::fmt::Debug); |
| |
| #[pin_project] |
| struct TupleStruct3(dyn core::fmt::Debug + Send); |
| |
| #[pin_project] |
| struct TupleStruct4(#[pin] dyn core::fmt::Debug + Send); |
| } |
| |
| #[test] |
| fn parse_self() { |
| macro_rules! mac { |
| ($($tt:tt)*) => { |
| $($tt)* |
| }; |
| } |
| |
| pub trait Trait { |
| type Assoc; |
| } |
| |
| #[allow(clippy::type_repetition_in_bounds)] |
| #[pin_project(project_replace)] |
| pub struct Generics<T: Trait<Assoc = Self>> |
| where |
| Self: Trait<Assoc = Self>, |
| <Self as Trait>::Assoc: Sized, |
| mac!(Self): Trait<Assoc = mac!(Self)>, |
| { |
| _f: T, |
| } |
| |
| impl<T: Trait<Assoc = Self>> Trait for Generics<T> { |
| type Assoc = Self; |
| } |
| |
| #[pin_project(project_replace)] |
| pub struct Struct { |
| _f1: Box<Self>, |
| _f2: Box<<Self as Trait>::Assoc>, |
| _f3: Box<mac!(Self)>, |
| _f4: [(); Self::ASSOC], |
| _f5: [(); Self::assoc()], |
| _f6: [(); mac!(Self::assoc())], |
| } |
| |
| impl Struct { |
| const ASSOC: usize = 1; |
| const fn assoc() -> usize { |
| 0 |
| } |
| } |
| |
| impl Trait for Struct { |
| type Assoc = Self; |
| } |
| |
| #[pin_project(project_replace)] |
| struct Tuple( |
| Box<Self>, |
| Box<<Self as Trait>::Assoc>, |
| Box<mac!(Self)>, |
| [(); Self::ASSOC], |
| [(); Self::assoc()], |
| [(); mac!(Self::assoc())], |
| ); |
| |
| impl Tuple { |
| const ASSOC: usize = 1; |
| const fn assoc() -> usize { |
| 0 |
| } |
| } |
| |
| impl Trait for Tuple { |
| type Assoc = Self; |
| } |
| |
| #[pin_project(project = EnumProj, project_ref = EnumProjRef, project_replace = EnumProjOwn)] |
| enum Enum { |
| Struct { |
| _f1: Box<Self>, |
| _f2: Box<<Self as Trait>::Assoc>, |
| _f3: Box<mac!(Self)>, |
| _f4: [(); Self::ASSOC], |
| _f5: [(); Self::assoc()], |
| _f6: [(); mac!(Self::assoc())], |
| }, |
| Tuple( |
| Box<Self>, |
| Box<<Self as Trait>::Assoc>, |
| Box<mac!(Self)>, |
| [(); Self::ASSOC], |
| [(); Self::assoc()], |
| [(); mac!(Self::assoc())], |
| ), |
| } |
| |
| impl Enum { |
| const ASSOC: usize = 1; |
| const fn assoc() -> usize { |
| 0 |
| } |
| } |
| |
| impl Trait for Enum { |
| type Assoc = Self; |
| } |
| } |
| |
| #[test] |
| fn no_infer_outlives() { |
| trait Trait<X> { |
| type Y; |
| } |
| |
| struct Struct1<A>(A); |
| |
| impl<X, T> Trait<X> for Struct1<T> { |
| type Y = Option<T>; |
| } |
| |
| #[pin_project(project_replace)] |
| struct Struct2<A, B> { |
| _f: <Struct1<A> as Trait<B>>::Y, |
| } |
| } |
| |
| // https://github.com/rust-lang/rust/issues/47949 |
| // https://github.com/taiki-e/pin-project/pull/194#discussion_r419098111 |
| #[allow(clippy::many_single_char_names)] |
| #[test] |
| fn project_replace_panic() { |
| #[pin_project(project_replace)] |
| struct S<T, U> { |
| #[pin] |
| pinned: T, |
| unpinned: U, |
| } |
| |
| struct D<'a>(&'a mut bool, bool); |
| impl Drop for D<'_> { |
| fn drop(&mut self) { |
| *self.0 = true; |
| if self.1 { |
| panic!(); |
| } |
| } |
| } |
| |
| let (mut a, mut b, mut c, mut d) = (false, false, false, false); |
| let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { |
| let mut x = S { pinned: D(&mut a, true), unpinned: D(&mut b, false) }; |
| let _y = Pin::new(&mut x) |
| .project_replace(S { pinned: D(&mut c, false), unpinned: D(&mut d, false) }); |
| // Previous `x.pinned` was dropped and panicked when `project_replace` is |
| // called, so this is unreachable. |
| unreachable!(); |
| })); |
| assert!(res.is_err()); |
| assert!(a); |
| assert!(b); |
| assert!(c); |
| assert!(d); |
| |
| let (mut a, mut b, mut c, mut d) = (false, false, false, false); |
| let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { |
| let mut x = S { pinned: D(&mut a, false), unpinned: D(&mut b, true) }; |
| { |
| let _y = Pin::new(&mut x) |
| .project_replace(S { pinned: D(&mut c, false), unpinned: D(&mut d, false) }); |
| // `_y` (previous `x.unpinned`) live to the end of this scope, so |
| // this is not unreachable. |
| // unreachable!(); |
| } |
| unreachable!(); |
| })); |
| assert!(res.is_err()); |
| assert!(a); |
| assert!(b); |
| assert!(c); |
| assert!(d); |
| } |