Reduce dependency on futures-util (#3358)

examples/stream-to-file/Cargo.toml

@@ -6,7 +6,7 @@ publish = false
 
 [dependencies]
 axum = { path = "../../axum", features = ["multipart"] }
-futures = "0.3"
+futures-util = { version = "0.3", default-features = false, features = ["sink", "std"] }
 tokio = { version = "1.0", features = ["full"] }
 tokio-util = { version = "0.7", features = ["io"] }
 tracing = "0.1"

examples/stream-to-file/src/main.rs

@@ -12,8 +12,8 @@ use axum::{
     routing::{get, post},
     BoxError, Router,
 };
-use futures::{Stream, TryStreamExt};
-use std::io;
+use futures_util::{Stream, TryStreamExt};
+use std::{io, pin::pin};
 use tokio::{fs::File, io::BufWriter};
 use tokio_util::io::StreamReader;
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
@@ -112,8 +112,7 @@ where
     async {
         // Convert the stream into an `AsyncRead`.
         let body_with_io_error = stream.map_err(io::Error::other);
-        let body_reader = StreamReader::new(body_with_io_error);
-        futures::pin_mut!(body_reader);
+        let mut body_reader = pin!(StreamReader::new(body_with_io_error));
 
         // Create the file. `File` implements `AsyncWrite`.
         let path = std::path::Path::new(UPLOADS_DIRECTORY).join(path);