mirror of https://github.com/rust-lang/rust
61 lines
1.3 KiB
Rust
61 lines
1.3 KiB
Rust
use std::mem;
|
|
|
|
unsafe fn foo() -> (i8, *const (), Option<fn()>) {
|
|
let i = mem::transmute(bar);
|
|
//~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
|
|
|
|
|
|
let p = mem::transmute(foo);
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
let of = mem::transmute(main);
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
(i, p, of)
|
|
}
|
|
|
|
unsafe fn bar() {
|
|
// Error as usual if the resulting type is not pointer-sized.
|
|
mem::transmute::<_, u8>(main);
|
|
//~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
|
|
|
|
|
|
mem::transmute::<_, *mut ()>(foo);
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
mem::transmute::<_, fn()>(bar);
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
// No error if a coercion would otherwise occur.
|
|
mem::transmute::<fn(), usize>(main);
|
|
}
|
|
|
|
unsafe fn baz() {
|
|
mem::transmute::<_, *mut ()>(Some(foo));
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
mem::transmute::<_, fn()>(Some(bar));
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
mem::transmute::<_, Option<fn()>>(Some(baz));
|
|
//~^ ERROR can't transmute zero-sized type
|
|
|
|
|
|
// No error if a coercion would otherwise occur.
|
|
mem::transmute::<Option<fn()>, usize>(Some(main));
|
|
}
|
|
|
|
fn main() {
|
|
unsafe {
|
|
foo();
|
|
bar();
|
|
baz();
|
|
}
|
|
}
|