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I am trying to learn rust and got stuck at Ownership and Borrowing. 

let s1 = String::from("Hello");
let s2 = s1;
print!("{}", s1); //---> Why this is an error ?

let a = "hello";
let b = a;
print!("{}", a); //--> But why this is not ?

Can someone kindly help me out on this ?

padmanabhanm
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    TLDR: `String` is an owned type, so the ownership is transferred from `s1` to `s2` while `&str` is a reference type, so there is no ownership to be transferred. Or in other words, [reference types implement `Copy`](https://doc.rust-lang.org/std/primitive.reference.html#trait-implementations). – Boiethios Sep 16 '19 at 08:25
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    I'd say that a reference implements the Copy trait, while a String doesn't. The Copy trait is the real reason why there's no ownership transfer. – Denys Séguret Sep 16 '19 at 08:28

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