chore: fix Rust 1.91.0 lint for derivable Default

src/configure/auto_mozilla.rs

@@ -28,8 +28,9 @@ struct MozAutoconfigure {
     pub outgoing_servers: Vec<Server>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Default)]
 enum MozConfigTag {
+    #[default]
     Undefined,
     Hostname,
     Port,
@@ -37,12 +38,6 @@ enum MozConfigTag {
     Username,
 }
 
-impl Default for MozConfigTag {
-    fn default() -> Self {
-        Self::Undefined
-    }
-}
-
 impl FromStr for MozConfigTag {
     type Err = ();
 

src/context.rs

@@ -308,7 +308,7 @@ pub struct InnerContext {
 }
 
 /// The state of ongoing process.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 enum RunningState {
     /// Ongoing process is allocated.
     Running { cancel_sender: Sender<()> },
@@ -317,15 +317,10 @@ enum RunningState {
     ShallStop { request: tools::Time },
 
     /// There is no ongoing process, a new one can be allocated.
+    #[default]
     Stopped,
 }
 
-impl Default for RunningState {
-    fn default() -> Self {
-        Self::Stopped
-    }
-}
-
 /// Return some info about deltachat-core
 ///
 /// This contains information mostly about the library itself, the

src/ephemeral.rs

@@ -88,9 +88,10 @@ use crate::tools::{SystemTime, duration_to_str, time};
 use crate::{location, stats};
 
 /// Ephemeral timer value.
-#[derive(Debug, PartialEq, Eq, Copy, Clone, Serialize, Deserialize)]
+#[derive(Debug, PartialEq, Eq, Copy, Clone, Serialize, Deserialize, Default)]
 pub enum Timer {
     /// Timer is disabled.
+    #[default]
     Disabled,
 
     /// Timer is enabled.
@@ -125,12 +126,6 @@ impl Timer {
     }
 }
 
-impl Default for Timer {
-    fn default() -> Self {
-        Self::Disabled
-    }
-}
-
 impl fmt::Display for Timer {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.to_u32())

src/message.rs

@@ -381,9 +381,11 @@ impl rusqlite::types::FromSql for MsgId {
     ToSql,
     Serialize,
     Deserialize,
+    Default,
 )]
 #[repr(u8)]
 pub(crate) enum MessengerMessage {
+    #[default]
     No = 0,
     Yes = 1,
 
@@ -391,12 +393,6 @@ pub(crate) enum MessengerMessage {
     Reply = 2,
 }
 
-impl Default for MessengerMessage {
-    fn default() -> Self {
-        Self::No
-    }
-}
-
 /// An object representing a single message in memory.
 /// The message object is not updated.
 /// If you want an update, you have to recreate the object.