fix lifetime elision warnings

server/db/db.rs

@@ -2417,7 +2417,7 @@ impl<C: Clocks + Clone> Database<C> {
 
     /// Locks the database; the returned reference is the only way to perform (read or write)
     /// operations.
-    pub fn lock(&self) -> DatabaseGuard<C> {
+    pub fn lock(&self) -> DatabaseGuard<'_, C> {
         let timer = clock::TimerGuard::new(&self.clocks, acquisition);
         let db = self.db.as_ref().unwrap().lock();
         drop(timer);

server/db/signal.rs

@@ -81,12 +81,12 @@ impl Point {
     }
 
     /// Returns an iterator over state as of immediately before this point.
-    fn prev(&self) -> PointDataIterator {
+    fn prev(&self) -> PointDataIterator<'_> {
         PointDataIterator::new(&self.data[0..self.changes_off])
     }
 
     /// Returns an iterator over changes in this point.
-    fn changes(&self) -> PointDataIterator {
+    fn changes(&self) -> PointDataIterator<'_> {
         PointDataIterator::new(&self.data[self.changes_off..])
     }
 

server/db/upgrade/v5_to_v6.rs

@@ -27,7 +27,7 @@ fn default_pixel_aspect_ratio(width: u16, height: u16) -> (u16, u16) {
     (1, 1)
 }
 
-fn parse(data: &[u8]) -> Result<AvcDecoderConfigurationRecord, Error> {
+fn parse(data: &[u8]) -> Result<AvcDecoderConfigurationRecord<'_>, Error> {
     if data.len() < 94 || &data[4..8] != b"avc1" || &data[90..94] != b"avcC" {
         bail!(
             DataLoss,