Make embassy-net nightly-only.

It's useless without async traits, so juggling the `nightly` feature
around is not worth the pain.

7 files changed, 132 insertions, 143 deletions

diff --git a/embassy-net/Cargo.toml b/embassy-net/Cargo.toml
index 8484aebc0..b58b52f18 100644
--- a/embassy-net/Cargo.toml
+++ b/embassy-net/Cargo.toml
@@ -31,15 +31,13 @@ pool-32 = []
 pool-64 = []
 pool-128 = []
 
-nightly = ["embedded-io/async"]
-
 [dependencies]
 
 defmt = { version = "0.3", optional = true }
 log = { version = "0.4.14", optional = true }
 
 embassy             = { version = "0.1.0", path = "../embassy" }
-embedded-io = "0.3.0"
+embedded-io         = { version = "0.3.0", features = [ "async" ] }
 
 managed             = { version = "0.8.0", default-features = false, features = [ "map" ] }
 heapless            = { version = "0.7.5", default-features = false }
diff --git a/embassy-net/src/lib.rs b/embassy-net/src/lib.rs
index ded841909..18dc1ef61 100644
--- a/embassy-net/src/lib.rs
+++ b/embassy-net/src/lib.rs
@@ -1,9 +1,6 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![allow(clippy::new_without_default)]
-#![cfg_attr(
-    feature = "nightly",
-    feature(generic_associated_types, type_alias_impl_trait)
-)]
+#![feature(generic_associated_types, type_alias_impl_trait)]
 
 // This mod MUST go first, so that the others see its macros.
 pub(crate) mod fmt;
diff --git a/embassy-net/src/tcp/mod.rs b/embassy-net/src/tcp.rs
index 425e6acbc..c18651b93 100644
--- a/embassy-net/src/tcp/mod.rs
+++ b/embassy-net/src/tcp.rs
@@ -1,15 +1,14 @@
+use core::future::Future;
 use core::marker::PhantomData;
 use core::mem;
 use core::task::Poll;
+use futures::future::poll_fn;
 use smoltcp::iface::{Context as SmolContext, SocketHandle};
 use smoltcp::socket::TcpSocket as SyncTcpSocket;
 use smoltcp::socket::{TcpSocketBuffer, TcpState};
 use smoltcp::time::Duration;
 use smoltcp::wire::IpEndpoint;
 
-#[cfg(feature = "nightly")]
-mod io_impl;
-
 use super::stack::Stack;
 
 #[derive(PartialEq, Eq, Clone, Copy, Debug)]
@@ -221,10 +220,134 @@ impl<'d> embedded_io::Io for TcpSocket<'d> {
     type Error = Error;
 }
 
+impl<'d> embedded_io::asynch::Read for TcpSocket<'d> {
+    type ReadFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
+    where
+        Self: 'a;
+
+    fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
+        poll_fn(move |cx| {
+            // CAUTION: smoltcp semantics around EOF are different to what you'd expect
+            // from posix-like IO, so we have to tweak things here.
+            with_socket(self.handle, |s, _| match s.recv_slice(buf) {
+                // No data ready
+                Ok(0) => {
+                    s.register_recv_waker(cx.waker());
+                    Poll::Pending
+                }
+                // Data ready!
+                Ok(n) => Poll::Ready(Ok(n)),
+                // EOF
+                Err(smoltcp::Error::Finished) => Poll::Ready(Ok(0)),
+                // Connection reset. TODO: this can also be timeouts etc, investigate.
+                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
+                // smoltcp returns no errors other than the above.
+                Err(_) => unreachable!(),
+            })
+        })
+    }
+}
+
+impl<'d> embedded_io::asynch::Write for TcpSocket<'d> {
+    type WriteFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
+    where
+        Self: 'a;
+
+    fn write<'a>(&'a mut self, buf: &'a [u8]) -> Self::WriteFuture<'a> {
+        poll_fn(move |cx| {
+            with_socket(self.handle, |s, _| match s.send_slice(buf) {
+                // Not ready to send (no space in the tx buffer)
+                Ok(0) => {
+                    s.register_send_waker(cx.waker());
+                    Poll::Pending
+                }
+                // Some data sent
+                Ok(n) => Poll::Ready(Ok(n)),
+                // Connection reset. TODO: this can also be timeouts etc, investigate.
+                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
+                // smoltcp returns no errors other than the above.
+                Err(_) => unreachable!(),
+            })
+        })
+    }
+
+    type FlushFuture<'a> = impl Future<Output = Result<(), Self::Error>>
+    where
+        Self: 'a;
+
+    fn flush<'a>(&'a mut self) -> Self::FlushFuture<'a> {
+        poll_fn(move |_| {
+            Poll::Ready(Ok(())) // TODO: Is there a better implementation for this?
+        })
+    }
+}
+
 impl<'d> embedded_io::Io for TcpReader<'d> {
     type Error = Error;
 }
 
+impl<'d> embedded_io::asynch::Read for TcpReader<'d> {
+    type ReadFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
+    where
+        Self: 'a;
+
+    fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
+        poll_fn(move |cx| {
+            // CAUTION: smoltcp semantics around EOF are different to what you'd expect
+            // from posix-like IO, so we have to tweak things here.
+            with_socket(self.handle, |s, _| match s.recv_slice(buf) {
+                // No data ready
+                Ok(0) => {
+                    s.register_recv_waker(cx.waker());
+                    Poll::Pending
+                }
+                // Data ready!
+                Ok(n) => Poll::Ready(Ok(n)),
+                // EOF
+                Err(smoltcp::Error::Finished) => Poll::Ready(Ok(0)),
+                // Connection reset. TODO: this can also be timeouts etc, investigate.
+                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
+                // smoltcp returns no errors other than the above.
+                Err(_) => unreachable!(),
+            })
+        })
+    }
+}
+
 impl<'d> embedded_io::Io for TcpWriter<'d> {
     type Error = Error;
 }
+
+impl<'d> embedded_io::asynch::Write for TcpWriter<'d> {
+    type WriteFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
+    where
+        Self: 'a;
+
+    fn write<'a>(&'a mut self, buf: &'a [u8]) -> Self::WriteFuture<'a> {
+        poll_fn(move |cx| {
+            with_socket(self.handle, |s, _| match s.send_slice(buf) {
+                // Not ready to send (no space in the tx buffer)
+                Ok(0) => {
+                    s.register_send_waker(cx.waker());
+                    Poll::Pending
+                }
+                // Some data sent
+                Ok(n) => Poll::Ready(Ok(n)),
+                // Connection reset. TODO: this can also be timeouts etc, investigate.
+                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
+                // smoltcp returns no errors other than the above.
+                Err(_) => unreachable!(),
+            })
+        })
+    }
+
+    type FlushFuture<'a> = impl Future<Output = Result<(), Self::Error>>
+    where
+        Self: 'a;
+
+    fn flush<'a>(&'a mut self) -> Self::FlushFuture<'a> {
+        poll_fn(move |_| {
+            Poll::Ready(Ok(())) // TODO: Is there a better implementation for this?
+        })
+    }
+}
diff --git a/embassy-net/src/tcp/io_impl.rs b/embassy-net/src/tcp/io_impl.rs
deleted file mode 100644
index b30c920b8..000000000
--- a/embassy-net/src/tcp/io_impl.rs
+++ /dev/null
@@ -1,129 +0,0 @@
-use core::future::Future;
-use core::task::Poll;
-use futures::future::poll_fn;
-
-use super::{with_socket, Error, TcpReader, TcpSocket, TcpWriter};
-
-impl<'d> embedded_io::asynch::Read for TcpSocket<'d> {
-    type ReadFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
-    where
-        Self: 'a;
-
-    fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
-        poll_fn(move |cx| {
-            // CAUTION: smoltcp semantics around EOF are different to what you'd expect
-            // from posix-like IO, so we have to tweak things here.
-            with_socket(self.handle, |s, _| match s.recv_slice(buf) {
-                // No data ready
-                Ok(0) => {
-                    s.register_recv_waker(cx.waker());
-                    Poll::Pending
-                }
-                // Data ready!
-                Ok(n) => Poll::Ready(Ok(n)),
-                // EOF
-                Err(smoltcp::Error::Finished) => Poll::Ready(Ok(0)),
-                // Connection reset. TODO: this can also be timeouts etc, investigate.
-                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
-                // smoltcp returns no errors other than the above.
-                Err(_) => unreachable!(),
-            })
-        })
-    }
-}
-
-impl<'d> embedded_io::asynch::Write for TcpSocket<'d> {
-    type WriteFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
-    where
-        Self: 'a;
-
-    fn write<'a>(&'a mut self, buf: &'a [u8]) -> Self::WriteFuture<'a> {
-        poll_fn(move |cx| {
-            with_socket(self.handle, |s, _| match s.send_slice(buf) {
-                // Not ready to send (no space in the tx buffer)
-                Ok(0) => {
-                    s.register_send_waker(cx.waker());
-                    Poll::Pending
-                }
-                // Some data sent
-                Ok(n) => Poll::Ready(Ok(n)),
-                // Connection reset. TODO: this can also be timeouts etc, investigate.
-                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
-                // smoltcp returns no errors other than the above.
-                Err(_) => unreachable!(),
-            })
-        })
-    }
-
-    type FlushFuture<'a> = impl Future<Output = Result<(), Self::Error>>
-    where
-        Self: 'a;
-
-    fn flush<'a>(&'a mut self) -> Self::FlushFuture<'a> {
-        poll_fn(move |_| {
-            Poll::Ready(Ok(())) // TODO: Is there a better implementation for this?
-        })
-    }
-}
-
-impl<'d> embedded_io::asynch::Read for TcpReader<'d> {
-    type ReadFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
-    where
-        Self: 'a;
-
-    fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
-        poll_fn(move |cx| {
-            // CAUTION: smoltcp semantics around EOF are different to what you'd expect
-            // from posix-like IO, so we have to tweak things here.
-            with_socket(self.handle, |s, _| match s.recv_slice(buf) {
-                // No data ready
-                Ok(0) => {
-                    s.register_recv_waker(cx.waker());
-                    Poll::Pending
-                }
-                // Data ready!
-                Ok(n) => Poll::Ready(Ok(n)),
-                // EOF
-                Err(smoltcp::Error::Finished) => Poll::Ready(Ok(0)),
-                // Connection reset. TODO: this can also be timeouts etc, investigate.
-                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
-                // smoltcp returns no errors other than the above.
-                Err(_) => unreachable!(),
-            })
-        })
-    }
-}
-
-impl<'d> embedded_io::asynch::Write for TcpWriter<'d> {
-    type WriteFuture<'a> = impl Future<Output = Result<usize, Self::Error>>
-    where
-        Self: 'a;
-
-    fn write<'a>(&'a mut self, buf: &'a [u8]) -> Self::WriteFuture<'a> {
-        poll_fn(move |cx| {
-            with_socket(self.handle, |s, _| match s.send_slice(buf) {
-                // Not ready to send (no space in the tx buffer)
-                Ok(0) => {
-                    s.register_send_waker(cx.waker());
-                    Poll::Pending
-                }
-                // Some data sent
-                Ok(n) => Poll::Ready(Ok(n)),
-                // Connection reset. TODO: this can also be timeouts etc, investigate.
-                Err(smoltcp::Error::Illegal) => Poll::Ready(Err(Error::ConnectionReset)),
-                // smoltcp returns no errors other than the above.
-                Err(_) => unreachable!(),
-            })
-        })
-    }
-
-    type FlushFuture<'a> = impl Future<Output = Result<(), Self::Error>>
-    where
-        Self: 'a;
-
-    fn flush<'a>(&'a mut self) -> Self::FlushFuture<'a> {
-        poll_fn(move |_| {
-            Poll::Ready(Ok(())) // TODO: Is there a better implementation for this?
-        })
-    }
-}
diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index ce36c7da2..e310d25f2 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -90,7 +90,7 @@ time-driver-tim12 = ["_time-driver"]
 time-driver-tim15 = ["_time-driver"]
 
 # Enable nightly-only features
-nightly = ["embassy/nightly", "embassy-net?/nightly", "embedded-hal-1", "embedded-hal-async", "embedded-storage-async", "dep:embedded-io"]
+nightly = ["embassy/nightly", "embedded-hal-1", "embedded-hal-async", "embedded-storage-async", "dep:embedded-io"]
 
 # Reexport stm32-metapac at `embassy_stm32::pac`.
 # This is unstable because semver-minor (non-breaking) releases of embassy-stm32 may major-bump (breaking) the stm32-metapac version.
diff --git a/examples/nrf/Cargo.toml b/examples/nrf/Cargo.toml
index d96eedf98..124725f95 100644
--- a/examples/nrf/Cargo.toml
+++ b/examples/nrf/Cargo.toml
@@ -6,12 +6,12 @@ version = "0.1.0"
 
 [features]
 default = ["nightly"]
-nightly = ["embassy-nrf/nightly", "embassy-nrf/unstable-traits", "embassy-usb", "embassy-usb-serial", "embassy-usb-hid", "embassy-usb-ncm", "embedded-io/async", "embassy-net/nightly"]
+nightly = ["embassy-nrf/nightly", "embassy-nrf/unstable-traits", "embassy-usb", "embassy-usb-serial", "embassy-usb-hid", "embassy-usb-ncm", "embedded-io/async", "embassy-net"]
 
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-timestamp-uptime"] }
 embassy-nrf = { version = "0.1.0", path = "../../embassy-nrf", features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote", "unstable-pac"] }
-embassy-net = { version = "0.1.0", path = "../../embassy-net", features = ["defmt", "tcp", "dhcpv4", "medium-ethernet", "pool-16"] }
+embassy-net = { version = "0.1.0", path = "../../embassy-net", features = ["defmt", "tcp", "dhcpv4", "medium-ethernet", "pool-16"], optional = true }
 embassy-usb = { version = "0.1.0", path = "../../embassy-usb", features = ["defmt"], optional = true }
 embassy-usb-serial = { version = "0.1.0", path = "../../embassy-usb-serial", features = ["defmt"], optional = true }
 embassy-usb-hid = { version = "0.1.0", path = "../../embassy-usb-hid", features = ["defmt"], optional = true }
diff --git a/examples/std/Cargo.toml b/examples/std/Cargo.toml
index 863760a45..7e1c2e4bb 100644
--- a/examples/std/Cargo.toml
+++ b/examples/std/Cargo.toml
@@ -6,7 +6,7 @@ version = "0.1.0"
 
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["log", "std", "time", "nightly"] }
-embassy-net = { version = "0.1.0", path = "../../embassy-net", features=["nightly", "std", "log", "medium-ethernet", "tcp", "dhcpv4", "pool-16"] }
+embassy-net = { version = "0.1.0", path = "../../embassy-net", features=[ "std", "log", "medium-ethernet", "tcp", "dhcpv4", "pool-16"] }
 embedded-io = { version = "0.3.0", features = ["async", "std", "futures"] }
 
 async-io = "1.6.0"