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// Forbid assignment into a dynamically sized type.
#![feature(unsized_tuple_coercion)]
type Fat<T> = (isize, &'static str, T);
#[derive(PartialEq,Eq)]
struct Bar;
#[derive(PartialEq,Eq)]
struct Bar1 {
f: isize
}
trait ToBar {
fn to_bar(&self) -> Bar;
fn to_val(&self) -> isize;
}
impl ToBar for Bar1 {
fn to_bar(&self) -> Bar {
Bar
}
fn to_val(&self) -> isize {
self.f
}
}
pub fn main() {
// Assignment.
let f5: &mut Fat<dyn ToBar> = &mut (5, "some str", Bar1 {f :42});
let z: Box<dyn ToBar> = Box::new(Bar1 {f: 36});
f5.2 = Bar1 {f: 36};
//~^ ERROR mismatched types
//~| expected `dyn ToBar`, found `Bar1`
//~| expected trait object `dyn ToBar`
//~| found struct `Bar1`
//~| ERROR the size for values of type
}
|
