mirror of https://github.com/rust-lang/rust
35 lines
793 B
Rust
35 lines
793 B
Rust
//@ run-pass
|
|
|
|
#![feature(ptr_metadata)]
|
|
|
|
trait Foo {
|
|
fn foo(&self) {} //~ WARN method `foo` is never used
|
|
}
|
|
|
|
struct Bar;
|
|
|
|
impl Foo for Bar {}
|
|
|
|
fn main() {
|
|
// Test we can turn a fat pointer to array back into a thin pointer.
|
|
let a: *const [i32] = &[1, 2, 3];
|
|
let b = a as *const [i32; 2];
|
|
unsafe {
|
|
assert_eq!(*b, [1, 2]);
|
|
}
|
|
|
|
// Test conversion to an address (usize).
|
|
let a: *const [i32; 3] = &[1, 2, 3];
|
|
let b: *const [i32] = a;
|
|
assert_eq!(a as usize, b as *const () as usize);
|
|
|
|
// And conversion to a void pointer/address for trait objects too.
|
|
let a: *mut dyn Foo = &mut Bar;
|
|
let b = a as *mut () as usize;
|
|
let c = a as *const () as usize;
|
|
let d = a.to_raw_parts().0 as usize;
|
|
|
|
assert_eq!(b, d);
|
|
assert_eq!(c, d);
|
|
}
|