Fix the build with the ssl feature

Also add a cargo check in the CI to make sure that it won't be broken
again

.travis.yml

@@ -9,6 +9,8 @@ matrix:
   - rust: nightly
 script:
     - cargo build
+    - cargo check --features ssl
+    - cargo check --features nativetls
     - cargo test
     - bash -c 'if [[ "$TRAVIS_RUST_VERSION" == "nightly" ]] ; then cargo install clippy --force && cargo clippy -- -A doc_markdown -A cyclomatic_complexity -A collapsible_if ; fi'
     - bash -c 'if [[ "$TRAVIS_RUST_VERSION" == "nightly" ]] ; then rustup component add rustfmt-preview && cargo fmt --all -- --write-mode=diff ; fi'

src/stream.rs

@@ -7,7 +7,7 @@ use std::net::SocketAddr;
 use bytes::{Buf, BufMut};
 use mio::tcp::TcpStream;
 #[cfg(feature = "ssl")]
-use openssl::ssl::Error as SslError;
+use openssl::ssl::{Error as SslError, HandshakeError, MidHandshakeSslStream, SslStream};
 #[cfg(feature = "nativetls")]
 use native_tls::{HandshakeError, MidHandshakeTlsStream as MidHandshakeSslStream, TlsStream as SslStream};