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Diffstat (limited to 'vendor/pin-project-lite/tests/test.rs')
-rw-r--r-- | vendor/pin-project-lite/tests/test.rs | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/vendor/pin-project-lite/tests/test.rs b/vendor/pin-project-lite/tests/test.rs new file mode 100644 index 000000000..ed9b75c42 --- /dev/null +++ b/vendor/pin-project-lite/tests/test.rs @@ -0,0 +1,695 @@ +#![warn(rust_2018_idioms, single_use_lifetimes)] +#![allow(dead_code)] + +#[macro_use] +mod auxiliary; + +use core::{ + marker::{PhantomData, PhantomPinned}, + pin::Pin, +}; + +use pin_project_lite::pin_project; + +#[test] +fn projection() { + pin_project! { + #[project = StructProj] + #[project_ref = StructProjRef] + #[project_replace = StructProjReplace] + #[derive(Default)] + 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 StructProjReplace { f1: PhantomData, f2 } = + s.as_mut().project_replace(Struct::default()); + assert_eq!(f2, 2); + let StructProj { f1, f2 } = s.project(); + assert_eq!(*f1, 0); + assert_eq!(*f2, 0); + } + + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + #[project_replace = EnumProjReplace] + #[derive(Eq, PartialEq, Debug)] + enum Enum<C, D> { + Struct { + #[pin] + f1: C, + f2: D, + }, + Unit, + } + } + + let mut e = Enum::Struct { f1: 1, f2: 2 }; + let mut e = Pin::new(&mut e); + + match e.as_mut().project() { + EnumProj::Struct { f1, f2 } => { + let _: Pin<&mut i32> = f1; + assert_eq!(*f1, 1); + let _: &mut i32 = f2; + assert_eq!(*f2, 2); + } + EnumProj::Unit => unreachable!(), + } + + assert_eq!(&*e, &Enum::Struct { f1: 1, f2: 2 }); + + if let EnumProj::Struct { f1, f2 } = e.as_mut().project() { + let _: Pin<&mut i32> = f1; + assert_eq!(*f1, 1); + let _: &mut i32 = f2; + assert_eq!(*f2, 2); + } + + if let EnumProjReplace::Struct { f1: PhantomData, f2 } = e.as_mut().project_replace(Enum::Unit) + { + assert_eq!(f2, 2); + } +} + +#[test] +fn enum_project_set() { + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + #[derive(Eq, PartialEq, Debug)] + enum Enum { + V1 { #[pin] f: u8 }, + V2 { f: bool }, + } + } + + let mut e = Enum::V1 { f: 25 }; + let mut e_orig = Pin::new(&mut e); + let e_proj = e_orig.as_mut().project(); + + match e_proj { + EnumProj::V1 { f } => { + let new_e = Enum::V2 { f: f.as_ref().get_ref() == &25 }; + e_orig.set(new_e); + } + EnumProj::V2 { .. } => unreachable!(), + } + + assert_eq!(e, Enum::V2 { f: true }); +} + +#[test] +fn where_clause() { + pin_project! { + struct Struct<T> + where + T: Copy, + { + f: T, + } + } + + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + enum Enum<T> + where + T: Copy, + { + V { f: T }, + } + } +} + +#[test] +fn where_clause_and_associated_type_field() { + pin_project! { + struct Struct1<I> + where + I: Iterator, + { + #[pin] + f1: I, + f2: I::Item, + } + } + + pin_project! { + struct Struct2<I, J> + where + I: Iterator<Item = J>, + { + #[pin] + f1: I, + f2: J, + } + } + + pin_project! { + pub struct Struct3<T> + where + T: 'static, + { + f: T, + } + } + + trait Static: 'static {} + + impl<T> Static for Struct3<T> {} + + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + enum Enum<I> + where + I: Iterator, + { + V1 { #[pin] f: I }, + V2 { f: I::Item }, + } + } +} + +#[test] +fn derive_copy() { + pin_project! { + #[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! { + struct Struct { + f: NotCopy, + } + } + + let x = Struct { f: NotCopy }; + let _val: NotCopy = x.f; + + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + enum Enum { + V { f: NotCopy }, + } + } + + let x = Enum::V { f: NotCopy }; + #[allow(clippy::infallible_destructuring_match)] + let _val: NotCopy = match x { + Enum::V { f } => f, + }; +} + +#[test] +fn trait_bounds_on_type_generics() { + pin_project! { + pub struct Struct1<'a, T: ?Sized> { + f: &'a mut T, + } + } + + pin_project! { + pub struct Struct2<'a, T: ::core::fmt::Debug> { + f: &'a mut T, + } + } + + pin_project! { + pub struct Struct3<'a, T: core::fmt::Debug> { + f: &'a mut T, + } + } + + // pin_project! { + // pub struct Struct4<'a, T: core::fmt::Debug + core::fmt::Display> { + // f: &'a mut T, + // } + // } + + // pin_project! { + // pub struct Struct5<'a, T: core::fmt::Debug + ?Sized> { + // f: &'a mut T, + // } + // } + + pin_project! { + pub struct Struct6<'a, T: core::fmt::Debug = [u8; 16]> { + f: &'a mut T, + } + } + + let _: Struct6<'_> = Struct6 { f: &mut [0_u8; 16] }; + + pin_project! { + pub struct Struct7<T: 'static> { + f: T, + } + } + + trait Static: 'static {} + + impl<T> Static for Struct7<T> {} + + pin_project! { + pub struct Struct8<'a, 'b: 'a> { + f1: &'a u8, + f2: &'b u8, + } + } + + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + enum Enum<'a, T: ?Sized> { + V { f: &'a mut T }, + } + } +} + +#[test] +fn private_type_in_public_type() { + pin_project! { + pub struct PublicStruct<T> { + #[pin] + inner: PrivateStruct<T>, + } + } + + struct PrivateStruct<T>(T); +} + +#[allow(clippy::needless_lifetimes)] +#[test] +fn lifetime_project() { + pin_project! { + struct Struct1<T, U> { + #[pin] + pinned: T, + unpinned: U, + } + } + + pin_project! { + struct Struct2<'a, T, U> { + #[pin] + pinned: &'a T, + unpinned: U, + } + } + + pin_project! { + #[project = EnumProj] + #[project_ref = EnumProjRef] + 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_lite::pin_project; + + pin_project! { + 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! { + pub struct NoGenerics { + #[pin] + f: PhantomPinned, + } + } + + assert_not_unpin!(NoGenerics); +} + +#[test] +fn dst() { + pin_project! { + pub 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! { + pub 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; + + pin_project! { + struct Struct3<T> + where + T: ?Sized, + { + f: T, + } + } + + pin_project! { + struct Struct4<T> + where + T: ?Sized, + { + #[pin] + f: T, + } + } + + pin_project! { + struct Struct11<'a, T: ?Sized, U: ?Sized> { + f1: &'a mut T, + f2: 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, + } + } +} + +#[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! { + struct Struct2<A, B> { + _f: <Struct1<A> as Trait<B>>::Y, + } + } +} + +// https://github.com/taiki-e/pin-project-lite/issues/31 +#[test] +fn trailing_comma() { + pub trait T {} + + pin_project! { + pub struct S1< + A: T, + B: T, + > { + f: (A, B), + } + } + + pin_project! { + pub struct S2< + A, + B, + > + where + A: T, + B: T, + { + f: (A, B), + } + } + + pin_project! { + #[allow(explicit_outlives_requirements)] + pub struct S3< + 'a, + A: 'a, + B: 'a, + > { + f: &'a (A, B), + } + } + + // pin_project! { + // pub struct S4< + // 'a, + // 'b: 'a, // <----- + // > { + // f: &'a &'b (), + // } + // } +} + +#[test] +fn attrs() { + pin_project! { + /// dox1 + #[derive(Clone)] + #[project = StructProj] + #[project_ref = StructProjRef] + /// dox2 + #[derive(Debug)] + /// dox3 + struct Struct { + // TODO + // /// dox4 + f: () + } + } + + pin_project! { + #[project = Enum1Proj] + #[project_ref = Enum1ProjRef] + enum Enum1 { + #[cfg(not(any()))] + V { + f: () + }, + } + } + + pin_project! { + /// dox1 + #[derive(Clone)] + #[project = Enum2Proj] + #[project_ref = Enum2ProjRef] + /// dox2 + #[derive(Debug)] + /// dox3 + enum Enum2 { + /// dox4 + V1 { + // TODO + // /// dox5 + f: () + }, + /// dox6 + V2, + } + } +} + +#[test] +fn pinned_drop() { + pin_project! { + pub struct Struct1<'a> { + was_dropped: &'a mut bool, + #[pin] + field: u8, + } + impl PinnedDrop for Struct1<'_> { + fn drop(this: Pin<&mut Self>) { + **this.project().was_dropped = true; + } + } + } + + let mut was_dropped = false; + drop(Struct1 { was_dropped: &mut was_dropped, field: 42 }); + assert!(was_dropped); + + pin_project! { + pub struct Struct2<'a> { + was_dropped: &'a mut bool, + #[pin] + field: u8, + } + impl PinnedDrop for Struct2<'_> { + fn drop(mut this: Pin<&mut Self>) { + **this.as_mut().project().was_dropped = true; + } + } + } + + trait Service<Request> { + type Error; + } + + pin_project! { + struct Struct3<'a, T, Request> + where + T: Service<Request>, + T::Error: std::error::Error, + { + was_dropped: &'a mut bool, + #[pin] + field: T, + req: Request, + } + + impl<T, Request> PinnedDrop for Struct3<'_, T, Request> + where + T: Service<Request>, + T::Error: std::error::Error, + { + fn drop(mut this: Pin<&mut Self>) { + **this.as_mut().project().was_dropped = true; + } + } + } +} |