drive by fix for some clippy warnings

src/id.rs

@@ -16,7 +16,7 @@ pub struct Id {
 }
 
 impl Id {
-    pub const MAX_U32: u32 = std::u32::MAX - 0xFF;
+    pub const MAX_U32: u32 = u32::MAX - 0xFF;
     pub const MAX_USIZE: usize = Self::MAX_U32 as usize;
 
     /// Create a `salsa::Id` from a u32 value. This value should

src/routes.rs

@@ -11,7 +11,7 @@ pub struct IngredientIndex(u32);
 impl IngredientIndex {
     /// Create an ingredient index from a usize.
     pub(crate) fn from(v: usize) -> Self {
-        assert!(v < (std::u32::MAX as usize));
+        assert!(v < (u32::MAX as usize));
         Self(v as u32)
     }
 

src/update.rs

@@ -55,6 +55,8 @@ pub mod helper {
     ///
     /// Impl will fulfill the postconditions of `maybe_update`
     pub unsafe trait Fallback<T> {
+        /// # Safety
+        ///
         /// Same safety conditions as `Update::maybe_update`
         unsafe fn maybe_update(old_pointer: *mut T, new_value: T) -> bool;
     }