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Support overloaded deref MIR lowering

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This commit is contained in:
hkalbasi 2023-03-17 14:02:55 +03:30
parent 9564773d5e
commit eb4939e217
18 changed files with 398 additions and 86 deletions
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31
crates/ide-diagnostics/src/handlers/mutability_errors.rs
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@ -566,7 +566,6 @@ fn f(x: [(i32, u8); 10]) {
#[test]
fn overloaded_deref() {
// FIXME: check for false negative
check_diagnostics(
r#"
//- minicore: deref_mut
@ -574,22 +573,36 @@ use core::ops::{Deref, DerefMut};
struct Foo;
impl Deref for Foo {
type Target = i32;
fn deref(&self) -> &i32 {
&5
type Target = (i32, u8);
fn deref(&self) -> &(i32, u8) {
&(5, 2)
}
}
impl DerefMut for Foo {
fn deref_mut(&mut self) -> &mut i32 {
&mut 5
fn deref_mut(&mut self) -> &mut (i32, u8) {
&mut (5, 2)
}
}
fn f() {
let x = Foo;
let mut x = Foo;
//^^^^^ 💡 weak: variable does not need to be mutable
let y = &*x;
let x = Foo;
let mut x = Foo;
let y: &mut i32 = &mut x;
let y = &mut *x;
//^^ 💡 error: cannot mutate immutable variable `x`
let x = Foo;
let x = Foo;
let y: &mut (i32, u8) = &mut x;
//^^^^^^ 💡 error: cannot mutate immutable variable `x`
let ref mut y = *x;
//^^ 💡 error: cannot mutate immutable variable `x`
let (ref mut y, _) = *x;
//^^ 💡 error: cannot mutate immutable variable `x`
match *x {
//^^ 💡 error: cannot mutate immutable variable `x`
(ref y, _) => (),
(_, ref mut y) => (),
}
}
"#,
);