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//@ check-fail
#![feature(derive_from)]
#![allow(dead_code)]
use std::from::From;
#[derive(From)]
//~^ ERROR `#[derive(From)]` used on a struct with no fields
struct S1;
#[derive(From)]
//~^ ERROR `#[derive(From)]` used on a struct with no fields
struct S2 {}
#[derive(From)]
//~^ ERROR `#[derive(From)]` used on a struct with multiple fields
struct S3(u32, bool);
#[derive(From)]
//~^ ERROR `#[derive(From)]` used on a struct with multiple fields
struct S4 {
a: u32,
b: bool,
}
#[derive(From)]
//~^ ERROR `#[derive(From)]` used on an enum
enum E1 {}
#[derive(From)]
struct SUnsizedField<T: ?Sized> {
last: T,
//~^ ERROR the size for values of type `T` cannot be known at compilation time [E0277]
}
fn main() {}
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