move to a predicate-based module system, move to loader.[rs|pl]-based compilation, add support for incremental clause compilation

src/machine/streams.rs

@@ -179,10 +179,10 @@ impl Drop for StreamInstance {
     fn drop(&mut self) {
         match self {
             StreamInstance::TcpStream(_, ref mut tcp_stream) => {
-                discard_result!(tcp_stream.shutdown(Shutdown::Both));
+                tcp_stream.shutdown(Shutdown::Both).unwrap();
             }
             StreamInstance::TlsStream(_, ref mut tls_stream) => {
-                discard_result!(tls_stream.shutdown());
+                tls_stream.shutdown().unwrap();
             }
             _ => {
             }