Function try_read_u16 

pub(crate) fn try_read_u16(
    slice: &[u8],
    what: &'static str,
) -> Result<(u16, usize), DeserializeError>

Try to read a u16 from the beginning of the given slice in native endian format. If the slice has fewer than 2 bytes, then this returns an error. The error message will include the what description of what is being deserialized, for better error messages. what should be a noun in singular form.

Upon success, this also returns the number of bytes read.