chore: apply unreachable_pub and missing_debug_implementations to all crates (#1424)

tokio-io/src/io/mod.rs

@@ -52,6 +52,9 @@ mod shutdown;
 mod write;
 mod write_all;
 
+#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411
 pub use self::async_buf_read_ext::AsyncBufReadExt;
+#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411
 pub use self::async_read_ext::AsyncReadExt;
+#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411
 pub use self::async_write_ext::AsyncWriteExt;

tokio-io/src/lib.rs

@@ -1,5 +1,10 @@
 #![doc(html_root_url = "https://docs.rs/tokio-io/0.2.0-alpha.1")]
-#![warn(missing_debug_implementations, missing_docs, rust_2018_idioms)]
+#![warn(
+    missing_debug_implementations,
+    missing_docs,
+    rust_2018_idioms,
+    unreachable_pub
+)]
 #![doc(test(no_crate_inject, attr(deny(rust_2018_idioms))))]
 
 //! Core I/O traits and combinators when working with Tokio.