mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
408eeae59d
Rename `static_mut_ref` lint to `static_mut_refs`.
62 lines
1.4 KiB
Rust
62 lines
1.4 KiB
Rust
static static_x: i32 = 1;
|
|
static mut static_x_mut: i32 = 1;
|
|
|
|
fn main() {
|
|
let x = 1;
|
|
let mut x_mut = 1;
|
|
|
|
{
|
|
// borrow of local
|
|
let _y1 = &mut x; //~ ERROR [E0596]
|
|
let _y2 = &mut x_mut; // No error
|
|
}
|
|
|
|
{
|
|
// borrow of static
|
|
let _y1 = &mut static_x; //~ ERROR [E0596]
|
|
unsafe {
|
|
let _y2 = &mut static_x_mut;
|
|
//~^ WARN mutable reference to mutable static is discouraged [static_mut_refs]
|
|
}
|
|
}
|
|
|
|
{
|
|
// borrow of deref to box
|
|
let box_x = Box::new(1);
|
|
let mut box_x_mut = Box::new(1);
|
|
|
|
let _y1 = &mut *box_x; //~ ERROR [E0596]
|
|
let _y2 = &mut *box_x_mut; // No error
|
|
}
|
|
|
|
{
|
|
// borrow of deref to reference
|
|
let ref_x = &x;
|
|
let ref_x_mut = &mut x_mut;
|
|
|
|
let _y1 = &mut *ref_x; //~ ERROR [E0596]
|
|
let _y2 = &mut *ref_x_mut; // No error
|
|
}
|
|
|
|
{
|
|
// borrow of deref to pointer
|
|
let ptr_x: *const _ = &x;
|
|
let ptr_mut_x: *mut _ = &mut x_mut;
|
|
|
|
unsafe {
|
|
let _y1 = &mut *ptr_x; //~ ERROR [E0596]
|
|
let _y2 = &mut *ptr_mut_x; // No error
|
|
}
|
|
}
|
|
|
|
{
|
|
// borrowing mutably through an immutable reference
|
|
struct Foo<'a> {
|
|
f: &'a mut i32,
|
|
g: &'a i32,
|
|
};
|
|
let mut foo = Foo { f: &mut x_mut, g: &x };
|
|
let foo_ref = &foo;
|
|
let _y = &mut *foo_ref.f; //~ ERROR [E0596]
|
|
}
|
|
}
|