rust/tests/ui/dst/dst-bad-coercions.rs
2023-01-11 09:32:08 +00:00

27 lines
776 B
Rust

// Test implicit coercions involving DSTs and raw pointers.
struct S;
trait T {}
impl T for S {}
struct Foo<T: ?Sized> {
f: T
}
pub fn main() {
// Test that we cannot convert from *-ptr to &S and &T
let x: *const S = &S;
let y: &S = x; //~ ERROR mismatched types
let y: &dyn T = x; //~ ERROR mismatched types
// Test that we cannot convert from *-ptr to &S and &T (mut version)
let x: *mut S = &mut S;
let y: &S = x; //~ ERROR mismatched types
let y: &dyn T = x; //~ ERROR mismatched types
// Test that we cannot convert an immutable ptr to a mutable one using *-ptrs
let x: &mut dyn T = &S; //~ ERROR mismatched types
let x: *mut dyn T = &S; //~ ERROR mismatched types
let x: *mut S = &S; //~ ERROR mismatched types
}