Code shared from the Rust Playground

playground_02.rs

use std::io::{BufRead};

struct Processor<B: BufRead> {
    reader: B
}

// If you uncomment p in ValidatorA, compilation fails because the size of
// ValidatorA can't be determined at compile time. Fair enough.
struct ValidatorA {
//    p : Processor<BufRead>    
}

// In ValidatorB, compilation fails for the same reason as above - but why?
// Aren't references a fixed size - a sort of fat pointer, if you will?
struct ValidatorB<'a> {
    p : &'a Processor<BufRead>
}