888 lines
20 KiB
Rust
888 lines
20 KiB
Rust
#![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);
|
|
}
|