error: enable core::error::Error for all error payloads

Author: phip1611

CHANGELOG.md

@@ -20,6 +20,9 @@
 - `HandleBuffer` and `ProtocolsPerHandle` now implement `Deref`. The
   `HandleBuffer::handles` and `ProtocolsPerHandle::protocols` methods have been
   deprecated.
+- The generic type `Data` of `uefi::Error<Data: Debug>` doesn't need to be
+  `Display` to be compatible with `core::error::Error`. Note that the error
+  Trait requires the `unstable` feature.
 
 ## uefi-macros - [Unreleased]
 

uefi/src/result/error.rs

@@ -1,7 +1,7 @@
 use super::Status;
 use core::fmt::{Debug, Display};
 
-/// Errors emitted from UEFI entry point must propagate erronerous UEFI statuses,
+/// Errors emitted from UEFI entry point must propagate erroneous UEFI statuses,
 /// and may optionally propagate additional entry point-specific data.
 #[derive(Debug, PartialEq, Eq)]
 pub struct Error<Data: Debug = ()> {
@@ -40,11 +40,11 @@ impl From<Status> for Error<()> {
     }
 }
 
-impl<Data: Debug + Display> Display for Error<Data> {
+impl<Data: Debug> Display for Error<Data> {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-        write!(f, "UEFI Error {}: {}", self.status(), self.data())
+        write!(f, "UEFI Error {}: {:?}", self.status(), self.data())
     }
 }
 
 #[cfg(feature = "unstable")]
-impl<Data: Debug + Display> core::error::Error for Error<Data> {}
+impl<Data: Debug> core::error::Error for Error<Data> {}