Don't allow unreachable_patterns

The warning happening in beta will be rolled back (for now) according to
rust-lang/rust#129352 (comment)

Until this change propagates to a beta release, we can live with the
warnings.

Author: jannic

rp2040-hal/src/uart/peripheral.rs

@@ -449,7 +449,6 @@ impl<D: UartDevice, P: ValidUartPinout<D>> Write<u8> for UartPeripheral<Enabled,
     }
 
     fn flush(&mut self) -> nb::Result<(), Self::Error> {
-        #[allow(unreachable_patterns)]
         super::writer::transmit_flushed(&self.device).map_err(|e| match e {
             WouldBlock => WouldBlock,
             Other(v) => match v {},

rp2040-hal/src/uart/writer.rs

@@ -87,7 +87,6 @@ pub(crate) fn write_raw<'d>(
 pub(crate) fn write_full_blocking(rb: &RegisterBlock, data: &[u8]) {
     let mut temp = data;
 
-    #[allow(unreachable_patterns)]
     while !temp.is_empty() {
         temp = match write_raw(rb, temp) {
             Ok(remaining) => remaining,
@@ -280,7 +279,6 @@ impl<D: UartDevice, P: ValidUartPinout<D>> Write<u8> for Writer<D, P> {
     }
 
     fn flush(&mut self) -> nb::Result<(), Self::Error> {
-        #[allow(unreachable_patterns)]
         transmit_flushed(&self.device).map_err(|e| match e {
             WouldBlock => WouldBlock,
             Other(v) => match v {},

rp235x-hal/src/uart/peripheral.rs

@@ -449,7 +449,6 @@ impl<D: UartDevice, P: ValidUartPinout<D>> Write<u8> for UartPeripheral<Enabled,
     }
 
     fn flush(&mut self) -> nb::Result<(), Self::Error> {
-        #[allow(unreachable_patterns)]
         super::writer::transmit_flushed(&self.device).map_err(|e| match e {
             WouldBlock => WouldBlock,
             Other(v) => match v {},

rp235x-hal/src/uart/writer.rs

@@ -87,7 +87,6 @@ pub(crate) fn write_raw<'d>(
 pub(crate) fn write_full_blocking(rb: &RegisterBlock, data: &[u8]) {
     let mut temp = data;
 
-    #[allow(unreachable_patterns)]
     while !temp.is_empty() {
         temp = match write_raw(rb, temp) {
             Ok(remaining) => remaining,
@@ -281,7 +280,6 @@ impl<D: UartDevice, P: ValidUartPinout<D>> Write<u8> for Writer<D, P> {
     }
 
     fn flush(&mut self) -> nb::Result<(), Self::Error> {
-        #[allow(unreachable_patterns)]
         transmit_flushed(&self.device).map_err(|e| match e {
             WouldBlock => WouldBlock,
             Other(v) => match v {},