rust/tests/ui/transmute/transmute-different-sizes.rs
2023-01-11 09:32:08 +00:00

32 lines
789 B
Rust

// normalize-stderr-test "\d+ bits" -> "N bits"
// Tests that `transmute` cannot be called on types of different size.
#![allow(warnings)]
#![feature(specialization)]
use std::mem::transmute;
unsafe fn f() {
let _: i8 = transmute(16i16);
//~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
}
unsafe fn g<T>(x: &T) {
let _: i8 = transmute(x);
//~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
}
trait Specializable { type Output; }
impl<T> Specializable for T {
default type Output = u16;
}
unsafe fn specializable<T>(x: u16) -> <T as Specializable>::Output {
transmute(x)
//~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
}
fn main() {}