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pub trait Into<T>: Sized {
fn into(self) -> T;
}
impl<T, U> Into<U> for T
where
U: From<T>,
{
fn into(self) -> T {
self
}
}
struct Wrapper<T>(Vec<T>);
impl<T> Into<Vec<T>> for Wrapper<T> {
fn into(self) -> Vec<T> {
self.0
}
}
impl<T> From<Wrapper<T>> for Vec<T> {
fn from(w: Wrapper<T>) -> Vec<T> {
w.0
}
}
fn is_hello<T: Into<Vec<u8>>>(s: T) {
let bytes = b"hello".to_vec();
assert_eq!(bytes, s.into());
}
let s = "hello".to_string();
is_hello(s);
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