feat(errors): add stable error propagation

firmware/libs/kaptan-err-propagate-macros/tests/ui/enum.rs

@@ -0,0 +1,43 @@
+extern crate self as kaptan_err_propagate;
+
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(Clone, Copy)]
+pub struct ErrorId(u16);
+
+impl ErrorId {
+    pub const fn new(id: u16) -> Self {
+        Self(id)
+    }
+
+    pub const fn get(self) -> u16 {
+        self.0
+    }
+}
+
+pub trait ErrorReport {
+    fn error_id(&self) -> ErrorId;
+}
+
+#[derive(Debug, KaptanError)]
+enum Generic<'a, T>
+where
+    T: Copy,
+{
+    #[kaptan_error(id = 65201)]
+    Unit,
+    #[kaptan_error(id = 65202)]
+    Tuple(T, u8),
+    #[kaptan_error(id = 65203)]
+    Named { label: &'a str },
+}
+
+fn main() {
+    fn assert_error<T: core::error::Error>() {}
+    assert_error::<Generic<'_, u8>>();
+    assert_eq!(Generic::<u8>::Unit.error_id().get(), 65201);
+    assert_eq!(Generic::Tuple(1_u8, 2).error_id().get(), 65202);
+    let named: Generic<'_, u8> = Generic::Named { label: "test" };
+    assert_eq!(named.error_id().get(), 65203);
+    assert_eq!(named.to_string(), "65203");
+}