Use derive-where instead of derivative (#585)

The derivative crate is dead:
mcarton/rust-derivative#117.

crates/board/CHANGELOG.md

@@ -13,6 +13,7 @@
 
 ### Patch
 
+- Use `derive-where` instead of `derivative`
 - Update dependencies
 - Remove workaround lint false positive
 

crates/board/Cargo.toml

@@ -22,7 +22,7 @@ bytemuck = { version = "1.16.0", default-features = false, optional = true }
 ccm = { version = "0.5.0", default-features = false, optional = true }
 crypto-common = { version = "0.1.6", default-features = false, optional = true }
 defmt = { version = "0.3.8", default-features = false, optional = true }
-derivative = { version = "2.2.0", default-features = false, features = ["use_core"] }
+derive-where = { version = "1.2.7", default-features = false, features = ["nightly"] }
 digest = { version = "0.10.7", default-features = false, optional = true }
 ecdsa = { version = "0.16.9", default-features = false, optional = true }
 elliptic-curve = { version = "0.13.8", default-features = false, optional = true }

crates/board/src/button.rs

@@ -17,14 +17,13 @@
 //! A button is an input interface with 2 states: pressed and released. Buttons must support
 //! triggering events when changing state. Events may be enabled or disabled per button.
 
-use derivative::Derivative;
+use derive_where::derive_where;
 
 use crate::{Error, Id, Support};
 
 /// Button event.
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), PartialEq(bound = ""), Eq(bound = ""))]
+#[derive_where(Debug, PartialEq, Eq)]
 pub struct Event<B: crate::Api + ?Sized> {
     /// The button that triggered the event.
     pub button: Id<crate::Button<B>>,

crates/board/src/lib.rs

@@ -26,7 +26,7 @@ extern crate alloc;
 use core::marker::PhantomData;
 use core::ops::Deref;
 
-use derivative::Derivative;
+use derive_where::derive_where;
 use wasefire_error::Code;
 pub use wasefire_error::Error;
 
@@ -151,8 +151,7 @@ pub trait Singleton: Sized {
 /// Events are de-duplicated if the previous one was not processed yet, because some events may
 /// trigger repeatedly.
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), PartialEq(bound = ""), Eq(bound = ""))]
+#[derive_where(Debug, PartialEq, Eq)]
 pub enum Event<B: Api + ?Sized> {
     /// Button event.
     #[cfg(feature = "api-button")]
@@ -186,11 +185,8 @@ pub enum Event<B: Api + ?Sized> {
 ///
 /// This type is useful when the type parameter `B` needs to be mentioned in an enum. This type can
 /// be destructed by calling its unreachable method.
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), Copy(bound = ""), Hash(bound = ""))]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Ord(bound = ""))]
-#[derivative(Ord = "feature_allow_slow_enum")]
-pub struct Impossible<B: Api + ?Sized>(Void, PhantomData<B>);
+#[derive_where(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Impossible<B: Api + ?Sized>(!, PhantomData<B>);
 
 #[cfg(feature = "defmt")]
 impl<B: Api + ?Sized> defmt::Format for Impossible<B> {
@@ -199,30 +195,13 @@ impl<B: Api + ?Sized> defmt::Format for Impossible<B> {
     }
 }
 
-// TODO(https://github.com/mcarton/rust-derivative/issues/112): Use Clone(bound = "") instead.
-impl<B: Api + ?Sized> Clone for Impossible<B> {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-// TODO(https://github.com/mcarton/rust-derivative/issues/112): Use PartialOrd(bound = "") instead.
-impl<B: Api + ?Sized> PartialOrd for Impossible<B> {
-    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
 impl<B: Api + ?Sized> Impossible<B> {
     /// Provides a static proof of dead code.
     pub fn unreachable(&self) -> ! {
         match self.0 {}
     }
 }
 
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
-enum Void {}
-
 /// Button interface.
 #[cfg(feature = "api-button")]
 pub type Button<B> = <B as Api>::Button;
@@ -271,9 +250,7 @@ pub type Uart<B> = <B as Api>::Uart;
 pub type Usb<B> = <B as Api>::Usb;
 
 /// Valid identifier for a countable API.
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), Copy(bound = ""), Hash(bound = ""))]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Ord(bound = ""))]
+#[derive_where(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
 pub struct Id<T: Support<usize> + ?Sized> {
     // Invariant: value < T::SUPPORT
     value: usize,
@@ -287,20 +264,6 @@ impl<T: Support<usize> + ?Sized> defmt::Format for Id<T> {
     }
 }
 
-// TODO(https://github.com/mcarton/rust-derivative/issues/112): Use Clone(bound = "") instead.
-impl<T: Support<usize> + ?Sized> Clone for Id<T> {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-// TODO(https://github.com/mcarton/rust-derivative/issues/112): Use PartialOrd(bound = "") instead.
-impl<T: Support<usize> + ?Sized> PartialOrd for Id<T> {
-    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
 impl<T: Support<usize>> Id<T> {
     /// Creates a safe identifier for an API with countable support.
     pub fn new(value: usize) -> Result<Self, Error> {

crates/board/src/timer.rs

@@ -16,14 +16,13 @@
 //!
 //! A timer triggers an event after a given amount of time (possibly periodically).
 
-use derivative::Derivative;
+use derive_where::derive_where;
 
 use crate::{Error, Id, Support};
 
 /// Timer event.
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), PartialEq(bound = ""), Eq(bound = ""))]
+#[derive_where(Debug, PartialEq, Eq)]
 pub struct Event<B: crate::Api + ?Sized> {
     /// The timer that triggered the event.
     pub timer: Id<crate::Timer<B>>,

crates/board/src/uart.rs

@@ -14,14 +14,13 @@
 
 //! UART interface.
 
-use derivative::Derivative;
+use derive_where::derive_where;
 
 use crate::{Error, Id, Support};
 
 /// UART event.
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), PartialEq(bound = ""), Eq(bound = ""))]
+#[derive_where(Debug, PartialEq, Eq)]
 pub struct Event<B: crate::Api + ?Sized> {
     /// The UART that triggered the event.
     pub uart: Id<crate::Uart<B>>,