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