Change visibility so you can export decode_length

ssz/src/decode.rs

@@ -71,7 +71,7 @@ pub fn decode_ssz_list<T>(ssz_bytes: &[u8], index: usize)
 /// Given some number of bytes, interpret the first four
 /// bytes as a 32-bit big-endian integer and return the
 /// result.
-fn decode_length(bytes: &[u8], index: usize, length_bytes: usize)
+pub fn decode_length(bytes: &[u8], index: usize, length_bytes: usize)
     -> Result<usize, DecodeError>
 {
     if bytes.len() < length_bytes {

ssz/src/lib.rs

@@ -10,8 +10,9 @@
 extern crate bytes;
 extern crate ethereum_types;
 
+pub mod decode;
+
 mod encode;
-mod decode;
 mod impl_encode;
 mod impl_decode;