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#![feature(proc_macro_hygiene, stmt_expr_attributes)]
use pin_project::{pin_project, project};
use std::pin::Pin;
#[project]
fn type_mismatch() {
#[pin_project]
enum Enum<A, B, C, D> {
Variant1(#[pin] A, B),
Variant2 {
#[pin]
field1: C,
field2: D,
},
None,
}
let mut foo = Enum::Variant1(1, 2);
let mut foo = Pin::new(&mut foo).project();
#[project]
match &mut foo {
Enum::Variant1(x, y) => {
let x: &mut Pin<&mut i32> = x;
assert_eq!(**x, 1);
let y: &mut &mut i32 = y;
assert_eq!(**y, 2);
}
Enum::Variant2 { field1, field2 } => {
let _x: &mut Pin<&mut i32> = field1;
let _y: &mut &mut i32 = field2;
}
None => {} //~ ERROR mismatched types
}
}
//~ ERROR mismatched types
// span is lost.
// Refs: https://github.com/rust-lang/rust/issues/43081
fn type_mismatch_span_issue() {
#[pin_project]
enum Enum<A, B, C, D> {
Variant1(#[pin] A, B),
Variant2 {
#[pin]
field1: C,
field2: D,
},
None,
}
let mut foo = Enum::Variant1(1, 2);
let mut foo = Pin::new(&mut foo).project();
#[project]
match &mut foo {
Enum::Variant1(x, y) => {
let x: &mut Pin<&mut i32> = x;
assert_eq!(**x, 1);
let y: &mut &mut i32 = y;
assert_eq!(**y, 2);
}
Enum::Variant2 { field1, field2 } => {
let _x: &mut Pin<&mut i32> = field1;
let _y: &mut &mut i32 = field2;
}
None => {}
}
}
fn main() {}
|
