/// index and a def index.
///
/// You can create a `DefId` from a `LocalDefId` using `local_def_id.to_def_id()`.
-#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Copy)]
+#[derive(Clone, PartialEq, Eq, Copy)]
+// Don't derive order on 64-bit big-endian, so we can be consistent regardless of field order.
+#[cfg_attr(not(all(target_pointer_width = "64", target_endian = "big")), derive(PartialOrd, Ord))]
// On below-64 bit systems we can simply use the derived `Hash` impl
#[cfg_attr(not(target_pointer_width = "64"), derive(Hash))]
#[repr(C)]
}
}
+// Implement the same comparison as derived with the other field order.
+#[cfg(all(target_pointer_width = "64", target_endian = "big"))]
+impl Ord for DefId {
+ #[inline]
+ fn cmp(&self, other: &DefId) -> std::cmp::Ordering {
+ Ord::cmp(&(self.index, self.krate), &(other.index, other.krate))
+ }
+}
+#[cfg(all(target_pointer_width = "64", target_endian = "big"))]
+impl PartialOrd for DefId {
+ #[inline]
+ fn partial_cmp(&self, other: &DefId) -> Option<std::cmp::Ordering> {
+ Some(Ord::cmp(self, other))
+ }
+}
+
impl DefId {
/// Makes a local `DefId` from the given `DefIndex`.
#[inline]