Derive Default where possible

src/contact.rs

@@ -223,12 +223,24 @@ pub struct Contact {
 
 /// Possible origins of a contact.
 #[derive(
-    Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, FromPrimitive, ToPrimitive, FromSql, ToSql,
+    Debug,
+    Default,
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    PartialOrd,
+    Ord,
+    FromPrimitive,
+    ToPrimitive,
+    FromSql,
+    ToSql,
 )]
 #[repr(u32)]
 pub enum Origin {
     /// Unknown origin. Can be used as a minimum origin to specify that the caller does not care
     /// about origin of the contact.
+    #[default]
     Unknown = 0,
 
     /// The contact is a mailing list address, needed to unblock mailing lists
@@ -287,12 +299,6 @@ pub enum Origin {
     ManuallyCreated = 0x0400_0000,
 }
 
-impl Default for Origin {
-    fn default() -> Self {
-        Origin::Unknown
-    }
-}
-
 impl Origin {
     /// Contacts that are known, i. e. they came in via accepted contacts or
     /// themselves an accepted contact. Known contacts are shown in the