util: Remove dev dep on tower (#401)

* util: Remove dev dep on tower

* Fix rustc bug

* enable call-all by default

tower-util/Cargo.toml

@@ -23,6 +23,7 @@ categories = ["asynchronous", "network-programming"]
 edition = "2018"
 
 [features]
+default = ["call-all"]
 call-all = ["futures-util"]
 
 [dependencies]
@@ -37,5 +38,4 @@ futures-util = { version = "0.3", optional = true, default-features = false, fea
 [dev-dependencies]
 tokio-test = "0.2"
 tokio = { version = "0.2", features = ["stream", "sync", "macros"] }
-tower = { version = "0.3", path = "../tower" }
 tower-test = { version = "0.3", path = "../tower-test" }

tower-util/src/call_all/ordered.rs

@@ -23,7 +23,7 @@ use tower_service::Service;
 /// use futures_util::future::{ready, Ready};
 /// use futures_util::StreamExt;
 /// use tower_service::Service;
-/// use tower::ServiceExt;
+/// use tower_util::ServiceExt;
 /// use tokio::prelude::*;
 ///
 /// // First, we need to have a Service to process our requests.

tower-util/src/lib.rs

@@ -30,7 +30,8 @@ pub use crate::{
 #[cfg(feature = "call-all")]
 pub use crate::call_all::{CallAll, CallAllUnordered};
 
-type Error = Box<dyn std::error::Error + Send + Sync>;
+#[doc(hidden)]
+pub type Error = Box<dyn std::error::Error + Send + Sync>;
 
 pub mod error {
     //! Error types

tower-util/tests/call_all.rs

@@ -6,9 +6,9 @@ use futures_util::{
 use std::task::{Context, Poll};
 use std::{cell::Cell, rc::Rc};
 use tokio_test::{assert_pending, assert_ready, task};
-use tower::ServiceExt;
 use tower_service::*;
 use tower_test::{assert_request_eq, mock};
+use tower_util::ServiceExt;
 
 type Error = Box<dyn std::error::Error + Send + Sync>;