rust/tests/ui/borrowck/borrowck-borrow-overloaded-deref.rs
2023-01-11 09:32:08 +00:00

44 lines
885 B
Rust

// Test how overloaded deref interacts with borrows when only
// Deref and not DerefMut is implemented.
use std::ops::Deref;
use std::rc::Rc;
fn deref_imm(x: Rc<isize>) {
let __isize = &*x;
}
fn deref_mut1(x: Rc<isize>) {
let __isize = &mut *x; //~ ERROR cannot borrow
}
fn deref_mut2(mut x: Rc<isize>) {
let __isize = &mut *x; //~ ERROR cannot borrow
}
fn deref_extend<'a>(x: &'a Rc<isize>) -> &'a isize {
&**x
}
fn deref_extend_mut1<'a>(x: &'a Rc<isize>) -> &'a mut isize {
&mut **x //~ ERROR cannot borrow
}
fn deref_extend_mut2<'a>(x: &'a mut Rc<isize>) -> &'a mut isize {
&mut **x //~ ERROR cannot borrow
}
fn assign1<'a>(x: Rc<isize>) {
*x = 3; //~ ERROR cannot assign
}
fn assign2<'a>(x: &'a Rc<isize>) {
**x = 3; //~ ERROR cannot assign
}
fn assign3<'a>(x: &'a mut Rc<isize>) {
**x = 3; //~ ERROR cannot assign
}
pub fn main() {}