Fix compilation.

Author: sunfishcode

test-programs/artifacts/tests/tcp_echo_server.rs

@@ -77,7 +77,7 @@ fn run_in_wasmtime(wasm: &[u8], stdout: Option<MemoryOutputPipe>) -> Result<()>
 #[test_log::test]
 fn tcp_echo_server() -> Result<()> {
     use std::io::{Read, Write};
-    use std::net::TcpStream;
+    use std::net::{Shutdown, TcpStream};
     use std::thread::sleep;
     use std::time::Duration;