Function from_bytes 

pub fn from_bytes<'a, T>(s: &'a [u8]) -> Result<T>
where
    T: Deserialize<'a>,

Example

Simple Usage:

let serialized = to_bytes(value).unwrap();
// Ignore the size
let new_value = from_bytes::<T>(&serialized[4..]).unwrap();

assert_eq!(value, new_value);

Replace T with type of value.

More complicated one (sending over socket):

let buffer = // read in 4 bytes;
let size: u32 = from_bytes(&buffer).unwrap();

let buffer = // read in `size` bytes;
let val: <T> = from_bytes(&buffer).unwrap();

Replace T with your own type.