Replace Future::boxed with Box::new.

In futures 0.1.15, the boxed() method on Future structs was
deprecated. This returned a BoxFuture type which had to be
declared either Send or 'static while wrapping a Future
in Box::new() allows inference of the appropriate trait bounds.

We already don't use the BoxFuture trait, so just call Box::new()
directly instead to avoid the deprecation warning and make it
easier to port to future releases.

See also rust-lang/futures-rs#228

src/cache/disk.rs

@@ -18,7 +18,6 @@ use cache::{
     CacheWrite,
     Storage,
 };
-use futures::Future;
 use futures_cpupool::CpuPool;
 use lru_disk_cache::LruDiskCache;
 use lru_disk_cache::Error as LruError;
@@ -62,7 +61,7 @@ impl Storage for DiskCache {
         let path = make_key_path(key);
         let lru = self.lru.clone();
         let key = key.to_owned();
-        self.pool.spawn_fn(move || {
+        Box::new(self.pool.spawn_fn(move || {
             let mut lru = lru.lock().unwrap();
             let f = match lru.get(&path) {
                 Ok(f) => f,
@@ -78,7 +77,7 @@ impl Storage for DiskCache {
             };
             let hit = CacheRead::from(f)?;
             Ok(Cache::Hit(hit))
-        }).boxed()
+        }))
     }
 
     fn put(&self, key: &str, entry: CacheWrite) -> SFuture<Duration> {
@@ -87,12 +86,12 @@ impl Storage for DiskCache {
         trace!("DiskCache::finish_put({})", key);
         let lru = self.lru.clone();
         let key = make_key_path(key);
-        self.pool.spawn_fn(move || {
+        Box::new(self.pool.spawn_fn(move || {
             let start = Instant::now();
             let v = entry.finish()?;
             lru.lock().unwrap().insert_bytes(key, &v)?;
             Ok(start.elapsed())
-        }).boxed()
+        }))
     }
 
     fn location(&self) -> String {

src/mock_command.rs

@@ -357,7 +357,7 @@ impl CommandChild for MockChild {
     fn take_stderr(&mut self) -> Option<io::Cursor<Vec<u8>>> { self.stderr.take() }
 
     fn wait(mut self) -> Box<Future<Item = ExitStatus, Error = io::Error>> {
-        future::result(self.wait_result.take().unwrap()).boxed()
+        Box::new(future::result(self.wait_result.take().unwrap()))
     }
 
 
@@ -370,7 +370,7 @@ impl CommandChild for MockChild {
                 stderr: stderr.map(|c| c.into_inner()).unwrap_or(vec!()),
             })
         });
-        future::result(result).boxed()
+        Box::new(future::result(result))
     }
 }
 

src/simples3/credential.rs

@@ -87,7 +87,7 @@ pub struct EnvironmentProvider;
 
 impl ProvideAwsCredentials for EnvironmentProvider {
     fn credentials(&self) -> SFuture<AwsCredentials> {
-		future::result(credentials_from_environment()).boxed()
+		Box::new(future::result(credentials_from_environment()))
     }
 }
 
@@ -189,7 +189,7 @@ impl ProvideAwsCredentials for ProfileProvider {
         let result = result.and_then(|mut profiles| {
             profiles.remove(self.profile()).ok_or("profile not found".into())
         });
-        future::result(result).boxed()
+        Box::new(future::result(result))
     }
 }