Update futures-preview to 0.3.0-alpha.16

Author: taiki-e

Cargo.toml

@@ -18,4 +18,4 @@ http = "0.1.17"
 http-service-hyper = { path = "http-service-hyper", version = "0.2.0" }
 
 [dependencies.futures-preview]
-version = "0.3.0-alpha.15"
+version = "0.3.0-alpha.16"

README.md

@@ -47,7 +47,7 @@
 </div>
 
 ## About
-The crate `http-service` provides the necessary types and traits to implement your own HTTP Server. It uses `hyper` for the lower level TCP abstraction. 
+The crate `http-service` provides the necessary types and traits to implement your own HTTP Server. It uses `hyper` for the lower level TCP abstraction.
 
 You can use the workspace member [`http-service-hyper`](https://crates.io/crates/http-service-hyper) to run your HTTP Server.
 
@@ -70,7 +70,7 @@ version = "0.1.1"
 
 **main.rs**
 ```rust
-#![feature(futures_api, async_await, existential_type)]
+#![feature(async_await, existential_type)]
 
 use futures::future::{self, FutureObj};
 use http_service::{HttpService, Response};

http-service-hyper/Cargo.toml

@@ -18,4 +18,4 @@ hyper = "0.12.27"
 
 [dependencies.futures-preview]
 features = ["compat"]
-version = "0.3.0-alpha.15"
+version = "0.3.0-alpha.16"

http-service-mock/Cargo.toml

@@ -14,4 +14,4 @@ version = "0.2.0"
 http-service = { version = "0.2.0", path = ".." }
 
 [dependencies.futures-preview]
-version = "0.3.0-alpha.15"
+version = "0.3.0-alpha.16"

src/lib.rs

@@ -3,7 +3,7 @@
 //!
 //! ## Example
 //! ```no_run, rust, ignore
-//! #![feature(futures_api, async_await, existential_type)]
+//! #![feature(async_await, existential_type)]
 //!
 //! use futures::{
 //!     future::{self, FutureObj},
@@ -64,12 +64,10 @@ use futures::{
     future,
     prelude::*,
     stream::{self, BoxStream},
-    task::Context,
-    Poll,
+    task::{Context, Poll},
 };
 
 use std::fmt;
-use std::marker::Unpin;
 use std::pin::Pin;
 
 /// The raw body of an http request or response.
@@ -96,7 +94,6 @@ impl Body {
     }
 
     /// Reads the stream into a new `Vec`.
-    #[allow(unused_mut)]
     #[allow(clippy::wrong_self_convention)] // https://github.com/rust-lang/rust-clippy/issues/4037
     pub async fn into_vec(mut self) -> std::io::Result<Vec<u8>> {
         let mut bytes = Vec::new();