Fixes needed since qlog 0.2 uses serde_json

See rust-lang/rust#46257

This just requires us to be a little more explicit about types in a couple
places

neqo-transport/src/packet.rs

@@ -721,7 +721,7 @@ mod tests {
         padded.extend_from_slice(EXTRA);
         let (packet, remainder) = PublicPacket::decode(&padded, &cid_mgr()).unwrap();
         assert_eq!(packet.packet_type(), PacketType::Initial);
-        assert_eq!(&packet.dcid()[..], &[]);
+        assert_eq!(&packet.dcid()[..], &[] as &[u8]);
         assert_eq!(&packet.scid()[..], SERVER_CID);
         assert!(packet.token().is_empty());
         assert_eq!(remainder, EXTRA);

test-fixture/src/assertions.rs

@@ -7,16 +7,16 @@
 use std::convert::TryInto;
 
 use neqo_common::Decoder;
-use neqo_transport::QUIC_VERSION;
+use neqo_transport::{Version, QUIC_VERSION};
 
 // Do a simple decode of the datagram to verify that it is coalesced.
 pub fn assert_coalesced_0rtt(payload: &[u8]) {
     assert!(payload.len() >= 1200);
     let mut dec = Decoder::from(payload);
     let initial_type = dec.decode_byte().unwrap(); // Initial
     assert_eq!(initial_type & 0b1111_0000, 0b1100_0000);
-    let version = dec.decode_uint(4).unwrap();
-    assert_eq!(version, QUIC_VERSION.into());
+    let version: Version = dec.decode_uint(4).unwrap().try_into().unwrap();
+    assert_eq!(version, QUIC_VERSION);
     dec.skip_vec(1); // DCID
     dec.skip_vec(1); // SCID
     dec.skip_vvec();