Do not use cfg_if for embedded-hal-async feature gates.

Old code used `cfg_if!` because rustc still parses code inside disabled cfg's, and Rust stable at that time couldn't parse the new GAT where-clause location. This is not the case anymore.

embassy-nrf/src/gpiote.rs

@@ -469,10 +469,12 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
     use futures::FutureExt;
 
+    use super::*;
+
     impl<'d, T: GpioPin> embedded_hal_async::digital::Wait for Input<'d, T> {
         type WaitForHighFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
@@ -537,4 +539,3 @@ cfg_if::cfg_if! {
         }
     }
 }
-}

embassy-nrf/src/spim.rs

@@ -475,10 +475,12 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
     use core::future::Future;
 
+    use super::*;
+
     impl<'d, T: Instance> embedded_hal_async::spi::SpiBusFlush for Spim<'d, T> {
         type FlushFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
@@ -512,15 +514,11 @@ cfg_if::cfg_if! {
 
         type TransferInPlaceFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
-            fn transfer_in_place<'a>(
-                &'a mut self,
-                words: &'a mut [u8],
-            ) -> Self::TransferInPlaceFuture<'a> {
+        fn transfer_in_place<'a>(&'a mut self, words: &'a mut [u8]) -> Self::TransferInPlaceFuture<'a> {
             self.transfer_in_place(words)
         }
     }
 }
-}
 
 impl<'d, T: Instance> SetConfig for Spim<'d, T> {
     type Config = Config;

embassy-nrf/src/twim.rs

@@ -838,8 +838,9 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
+    use super::*;
     impl<'d, T: Instance> embedded_hal_async::i2c::I2c for Twim<'d, T> {
         type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
@@ -877,7 +878,6 @@ cfg_if::cfg_if! {
         }
     }
 }
-}
 
 impl<'d, T: Instance> SetConfig for Twim<'d, T> {
     type Config = Config;

embassy-nrf/src/uarte.rs

@@ -1073,10 +1073,16 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly", feature = "_todo_embedded_hal_serial"))] {
+#[cfg(all(
+    feature = "unstable-traits",
+    feature = "nightly",
+    feature = "_todo_embedded_hal_serial"
+))]
+mod eha {
     use core::future::Future;
 
+    use super::*;
+
     impl<'d, T: Instance> embedded_hal_async::serial::Read for Uarte<'d, T> {
         type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
@@ -1121,9 +1127,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, U: Instance, T: TimerInstance> embedded_hal_async::serial::Read
-            for UarteWithIdle<'d, U, T>
-        {
+    impl<'d, U: Instance, T: TimerInstance> embedded_hal_async::serial::Read for UarteWithIdle<'d, U, T> {
         type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn read<'a>(&'a mut self, buffer: &'a mut [u8]) -> Self::ReadFuture<'a> {
@@ -1131,9 +1135,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, U: Instance, T: TimerInstance> embedded_hal_async::serial::Write
-            for UarteWithIdle<'d, U, T>
-        {
+    impl<'d, U: Instance, T: TimerInstance> embedded_hal_async::serial::Write for UarteWithIdle<'d, U, T> {
         type WriteFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn write<'a>(&'a mut self, buffer: &'a [u8]) -> Self::WriteFuture<'a> {
@@ -1147,4 +1149,3 @@ cfg_if::cfg_if! {
         }
     }
 }
-}

embassy-rp/src/uart.rs

@@ -477,12 +477,17 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly", feature = "_todo_embedded_hal_serial"))] {
+#[cfg(all(
+    feature = "unstable-traits",
+    feature = "nightly",
+    feature = "_todo_embedded_hal_serial"
+))]
+mod eha {
     use core::future::Future;
 
-        impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Write for UartTx<'d, T, M>
-        {
+    use super::*;
+
+    impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Write for UartTx<'d, T, M> {
         type WriteFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn write<'a>(&'a mut self, buf: &'a [u8]) -> Self::WriteFuture<'a> {
@@ -496,8 +501,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Read for UartRx<'d, T, M>
-        {
+    impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Read for UartRx<'d, T, M> {
         type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
@@ -505,8 +509,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Write for Uart<'d, T, M>
-        {
+    impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Write for Uart<'d, T, M> {
         type WriteFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn write<'a>(&'a mut self, buf: &'a [u8]) -> Self::WriteFuture<'a> {
@@ -520,8 +523,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Read for Uart<'d, T, M>
-        {
+    impl<'d, T: Instance, M: Mode> embedded_hal_async::serial::Read for Uart<'d, T, M> {
         type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
@@ -529,7 +531,6 @@ cfg_if::cfg_if! {
         }
     }
 }
-}
 
 mod sealed {
     use super::*;

embassy-stm32/src/exti.rs

@@ -165,10 +165,12 @@ mod eh1 {
         }
     }
 }
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
     use futures::FutureExt;
 
+    use super::*;
+
     impl<'d, T: GpioPin> embedded_hal_async::digital::Wait for ExtiInput<'d, T> {
         type WaitForHighFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
@@ -201,7 +203,6 @@ cfg_if::cfg_if! {
         }
     }
 }
-}
 
 struct ExtiInputFuture<'a> {
     pin: u8,

embassy-stm32/src/i2c/v2.rs

@@ -927,14 +927,14 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
-        use super::{RxDma, TxDma};
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
     use core::future::Future;
 
-        impl<'d, T: Instance, TXDMA: TxDma<T>, RXDMA: RxDma<T>> embedded_hal_async::i2c::I2c
-            for I2c<'d, T, TXDMA, RXDMA>
-        {
+    use super::super::{RxDma, TxDma};
+    use super::*;
+
+    impl<'d, T: Instance, TXDMA: TxDma<T>, RXDMA: RxDma<T>> embedded_hal_async::i2c::I2c for I2c<'d, T, TXDMA, RXDMA> {
         type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn read<'a>(&'a mut self, address: u8, buffer: &'a mut [u8]) -> Self::ReadFuture<'a> {
@@ -969,7 +969,6 @@ cfg_if::cfg_if! {
         }
     }
 }
-}
 
 impl<'d, T: Instance> SetConfig for I2c<'d, T> {
     type Config = Hertz;

embassy-stm32/src/spi/mod.rs

@@ -870,9 +870,11 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
     use core::future::Future;
+
+    use super::*;
     impl<'d, T: Instance, Tx, Rx> embedded_hal_async::spi::SpiBusFlush for Spi<'d, T, Tx, Rx> {
         type FlushFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
@@ -881,9 +883,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, T: Instance, Tx: TxDma<T>, Rx, W: Word> embedded_hal_async::spi::SpiBusWrite<W>
-            for Spi<'d, T, Tx, Rx>
-        {
+    impl<'d, T: Instance, Tx: TxDma<T>, Rx, W: Word> embedded_hal_async::spi::SpiBusWrite<W> for Spi<'d, T, Tx, Rx> {
         type WriteFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn write<'a>(&'a mut self, data: &'a [W]) -> Self::WriteFuture<'a> {
@@ -901,9 +901,7 @@ cfg_if::cfg_if! {
         }
     }
 
-        impl<'d, T: Instance, Tx: TxDma<T>, Rx: RxDma<T>, W: Word> embedded_hal_async::spi::SpiBus<W>
-            for Spi<'d, T, Tx, Rx>
-        {
+    impl<'d, T: Instance, Tx: TxDma<T>, Rx: RxDma<T>, W: Word> embedded_hal_async::spi::SpiBus<W> for Spi<'d, T, Tx, Rx> {
         type TransferFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
         fn transfer<'a>(&'a mut self, rx: &'a mut [W], tx: &'a [W]) -> Self::TransferFuture<'a> {
@@ -912,15 +910,11 @@ cfg_if::cfg_if! {
 
         type TransferInPlaceFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
 
-            fn transfer_in_place<'a>(
-                &'a mut self,
-                words: &'a mut [W],
-            ) -> Self::TransferInPlaceFuture<'a> {
+        fn transfer_in_place<'a>(&'a mut self, words: &'a mut [W]) -> Self::TransferInPlaceFuture<'a> {
             self.transfer_in_place(words)
         }
     }
 }
-}
 
 pub(crate) mod sealed {
     use super::*;

embassy-stm32/src/usart/mod.rs

@@ -361,10 +361,16 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly", feature = "_todo_embedded_hal_serial"))] {
+#[cfg(all(
+    feature = "unstable-traits",
+    feature = "nightly",
+    feature = "_todo_embedded_hal_serial"
+))]
+mod eha {
     use core::future::Future;
 
+    use super::*;
+
     impl<'d, T: BasicInstance, TxDma> embedded_hal_async::serial::Write for UartTx<'d, T, TxDma>
     where
         TxDma: crate::usart::TxDma<T>,
@@ -421,7 +427,6 @@ cfg_if::cfg_if! {
         }
     }
 }
-}
 
 #[cfg(feature = "nightly")]
 pub use buffered::*;

embassy-time/src/delay.rs

@@ -31,12 +31,15 @@ mod eh1 {
     }
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
-        use crate::Timer;
+#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
+mod eha {
     use core::future::Future;
+
     use futures_util::FutureExt;
 
+    use super::*;
+    use crate::Timer;
+
     impl embedded_hal_async::delay::DelayUs for Delay {
         type Error = core::convert::Infallible;
 
@@ -53,7 +56,6 @@ cfg_if::cfg_if! {
         }
     }
 }
-}
 
 mod eh02 {
     use embedded_hal_02::blocking::delay::{DelayMs, DelayUs};