Lifetimes of References
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There’s an important restriction on references, both mutable and immutable, they cannot live longer than the values they are referencing. Let’s look at an example:
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fn main() {let x: &i32 = {let y = 5;&y};println!("x == {}", x);}
This program defines a new variable, y, inside a block. That block then returns a reference to y. This program fails to compile: ...