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|
#![warn(unsafe_code)]
#![warn(rust_2018_idioms, single_use_lifetimes)]
#![allow(dead_code)]
// This hack is needed until https://github.com/rust-lang/rust/pull/69201
// makes it way into stable.
// Ceurrently, `#[attr] if true {}` doesn't even *parse* on stable,
// which means that it will error even behind a `#[rustversion::nightly]`
//
// This trick makes sure that we don't even attempt to parse
// the `#[project] if let _` test on stable.
#[rustversion::nightly]
include!("project_if_attr.rs.in");
use pin_project::{pin_project, project};
use std::pin::Pin;
#[project] // Nightly does not need a dummy attribute to the function.
#[test]
fn project_stmt_expr() {
// struct
#[pin_project]
struct Foo<T, U> {
#[pin]
field1: T,
field2: U,
}
let mut foo = Foo { field1: 1, field2: 2 };
#[project]
let Foo { field1, field2 } = Pin::new(&mut foo).project();
let x: Pin<&mut i32> = field1;
assert_eq!(*x, 1);
let y: &mut i32 = field2;
assert_eq!(*y, 2);
// tuple struct
#[pin_project]
struct Bar<T, U>(#[pin] T, U);
let mut bar = Bar(1, 2);
#[project]
let Bar(x, y) = Pin::new(&mut bar).project();
let x: Pin<&mut i32> = x;
assert_eq!(*x, 1);
let y: &mut i32 = y;
assert_eq!(*y, 2);
// enum
#[pin_project]
enum Baz<A, B, C, D> {
Variant1(#[pin] A, B),
Variant2 {
#[pin]
field1: C,
field2: D,
},
None,
}
let mut baz = Baz::Variant1(1, 2);
let mut baz = Pin::new(&mut baz).project();
#[project]
match &mut baz {
Baz::Variant1(x, y) => {
let x: &mut Pin<&mut i32> = x;
assert_eq!(**x, 1);
let y: &mut &mut i32 = y;
assert_eq!(**y, 2);
}
Baz::Variant2 { field1, field2 } => {
let _x: &mut Pin<&mut i32> = field1;
let _y: &mut &mut i32 = field2;
}
Baz::None => {}
}
#[project]
let val = match &mut baz {
Baz::Variant1(_, _) => true,
Baz::Variant2 { .. } => false,
Baz::None => false,
};
assert_eq!(val, true);
}
#[test]
fn project_impl() {
#[pin_project]
struct HasGenerics<T, U> {
#[pin]
field1: T,
field2: U,
}
#[project]
impl<T, U> HasGenerics<T, U> {
fn a(self) {
let Self { field1, field2 } = self;
let _x: Pin<&mut T> = field1;
let _y: &mut U = field2;
}
}
#[pin_project]
struct NoneGenerics {
#[pin]
field1: i32,
field2: u32,
}
#[project]
impl NoneGenerics {}
#[pin_project]
struct HasLifetimes<'a, T, U> {
#[pin]
field1: &'a mut T,
field2: U,
}
#[project]
impl<T, U> HasLifetimes<'_, T, U> {}
#[pin_project]
struct HasOverlappingLifetimes<'pin, T, U> {
#[pin]
field1: &'pin mut T,
field2: U,
}
#[allow(single_use_lifetimes)]
#[project]
impl<'pin, T, U> HasOverlappingLifetimes<'pin, T, U> {}
#[pin_project]
struct HasOverlappingLifetimes2<T, U> {
#[pin]
field1: T,
field2: U,
}
#[allow(single_use_lifetimes)]
#[project]
impl<T, U> HasOverlappingLifetimes2<T, U> {
fn foo<'pin>(&'pin self) {}
}
}
#[pin_project]
struct A {
#[pin]
field: u8,
}
mod project_use_1 {
use crate::A;
use core::pin::Pin;
use pin_project::project;
#[project]
use crate::A;
#[project]
#[test]
fn project_use() {
let mut x = A { field: 0 };
#[project]
let A { field } = Pin::new(&mut x).project();
let _: Pin<&mut u8> = field;
}
}
mod project_use_2 {
#[project]
use crate::A;
use pin_project::project;
#[project]
impl A {
fn project_use(self) {}
}
}
#[pin_project]
struct StructWhereClause<T>
where
T: Copy,
{
field: T,
}
#[pin_project]
struct TupleStructWhereClause<T>(T)
where
T: Copy;
#[pin_project]
enum EnumWhereClause<T>
where
T: Copy,
{
Variant(T),
}
|
