Replace inherent LifecycleId::from with standard From<u64> trait

src/api/mod.rs

@@ -88,22 +88,24 @@ impl fmt::Display for LifecycleId {
     }
 }
 
-impl LifecycleId {
-    /// Creates a new `LifecycleId`.
-    ///
-    /// Returns `None` if the value is zero, as zero is not a valid lifecycle identifier.
-    pub fn new(n: u64) -> Option<LifecycleId> {
-        NonZeroU64::new(n).map(LifecycleId)
-    }
-
+impl From<u64> for LifecycleId {
     /// Creates a new `LifecycleId` from a non-zero value.
     ///
     /// # Panics
     ///
     /// Panics if `n` is zero.
-    pub fn from(n: u64) -> LifecycleId {
+    fn from(n: u64) -> Self {
         debug_assert!(n != 0);
-        LifecycleId(NonZeroU64::new(n).unwrap())
+        Self(NonZeroU64::new(n).expect("LifecycleId cannot be zero"))
+    }
+}
+
+impl LifecycleId {
+    /// Creates a new `LifecycleId`.
+    ///
+    /// Returns `None` if the value is zero, as zero is not a valid lifecycle identifier.
+    pub fn new(n: u64) -> Option<LifecycleId> {
+        NonZeroU64::new(n).map(LifecycleId)
     }
 
     /// Returns the underlying value.