1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
|
// 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() {}
|