mirror of https://github.com/rust-lang/rust
88 lines
2.5 KiB
Rust
88 lines
2.5 KiB
Rust
#![allow(dead_code)]
|
|
|
|
// This tests the various kinds of assignments there are. Polonius used to generate `killed`
|
|
// facts only on simple assignments, but not projections, incorrectly causing errors to be emitted
|
|
// for code accepted by NLL. They are all variations from example code in the NLL RFC.
|
|
|
|
//@ check-pass
|
|
//@ compile-flags: -Z polonius
|
|
|
|
struct List<T> {
|
|
value: T,
|
|
next: Option<Box<List<T>>>,
|
|
}
|
|
|
|
// Assignment to a local: the `list` assignment should clear the existing
|
|
// borrows of `list.value` and `list.next`
|
|
fn assignment_to_local<T>(mut list: &mut List<T>) -> Vec<&mut T> {
|
|
let mut result = vec![];
|
|
loop {
|
|
result.push(&mut list.value);
|
|
if let Some(n) = list.next.as_mut() {
|
|
list = n;
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Assignment to a deref projection: the `*list` assignment should clear the existing
|
|
// borrows of `list.value` and `list.next`
|
|
fn assignment_to_deref_projection<T>(mut list: Box<&mut List<T>>) -> Vec<&mut T> {
|
|
let mut result = vec![];
|
|
loop {
|
|
result.push(&mut list.value);
|
|
if let Some(n) = list.next.as_mut() {
|
|
*list = n;
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Assignment to a field projection: the `list.0` assignment should clear the existing
|
|
// borrows of `list.0.value` and `list.0.next`
|
|
fn assignment_to_field_projection<T>(mut list: (&mut List<T>,)) -> Vec<&mut T> {
|
|
let mut result = vec![];
|
|
loop {
|
|
result.push(&mut list.0.value);
|
|
if let Some(n) = list.0.next.as_mut() {
|
|
list.0 = n;
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Assignment to a deref field projection: the `*list.0` assignment should clear the existing
|
|
// borrows of `list.0.value` and `list.0.next`
|
|
fn assignment_to_deref_field_projection<T>(mut list: (Box<&mut List<T>>,)) -> Vec<&mut T> {
|
|
let mut result = vec![];
|
|
loop {
|
|
result.push(&mut list.0.value);
|
|
if let Some(n) = list.0.next.as_mut() {
|
|
*list.0 = n;
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Similar to `assignment_to_deref_field_projection` but through a longer projection chain
|
|
fn assignment_through_projection_chain<T>(
|
|
mut list: (((((Box<&mut List<T>>,),),),),),
|
|
) -> Vec<&mut T> {
|
|
let mut result = vec![];
|
|
loop {
|
|
result.push(&mut ((((list.0).0).0).0).0.value);
|
|
if let Some(n) = ((((list.0).0).0).0).0.next.as_mut() {
|
|
*((((list.0).0).0).0).0 = n;
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
}
|