nrf/uarte: update to new api

embassy/src/util/mod.rs

@@ -2,6 +2,7 @@
 mod drop_bomb;
 mod forever;
 mod mutex;
+mod on_drop;
 mod portal;
 mod signal;
 
@@ -11,6 +12,7 @@ mod waker;
 pub use drop_bomb::*;
 pub use forever::*;
 pub use mutex::*;
+pub use on_drop::*;
 pub use portal::*;
 pub use signal::*;
 pub use waker::*;

embassy/src/util/on_drop.rs

@@ -0,0 +1,24 @@
+use core::mem;
+use core::mem::MaybeUninit;
+
+pub struct OnDrop<F: FnOnce()> {
+    f: MaybeUninit<F>,
+}
+
+impl<F: FnOnce()> OnDrop<F> {
+    pub fn new(f: F) -> Self {
+        Self {
+            f: MaybeUninit::new(f),
+        }
+    }
+
+    pub fn defuse(self) {
+        mem::forget(self)
+    }
+}
+
+impl<F: FnOnce()> Drop for OnDrop<F> {
+    fn drop(&mut self) {
+        unsafe { self.f.as_ptr().read()() }
+    }
+}