Multiple impls of a trait on the same type

impl_overlap.rs

// Source: https://codesandwich.github.io/overlapping_blanket_impls/
use std::convert::TryInto;

// Dummy Trait
trait Blanket<I> {
    fn blanket(&self) -> &'static str;
}

// Dummy Structs
struct Numbers;
struct Strings;

impl<T: TryInto<u8>> Blanket<&Numbers> for T {
    fn blanket(&self) -> &'static str {
        "try_into"
    }
}
impl<T: AsRef<[u8]>> Blanket<&Strings> for T {
    fn blanket(&self) -> &'static str {
        "as_ref"
    }
}

fn main() {
    assert_eq!("try_into", Blanket::blanket(&1_i8));
    assert_eq!("try_into", Blanket::blanket(&1_u8));
    assert_eq!("as_ref",   Blanket::blanket(&"str"));
    assert_eq!("as_ref",   Blanket::blanket(&"str".to_string()));
}