Replace derived Debug implementation of salsa::Id

src/id.rs

@@ -12,7 +12,7 @@ use crate::Database;
 /// You will rarely use the `Id` type directly, though you can.
 /// You are more likely to use types that implement the `AsId` trait,
 /// such as entity keys.
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Id {
     value: NonZeroU32,
 }
@@ -42,6 +42,12 @@ impl Id {
     }
 }
 
+impl Debug for Id {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.as_u32().fmt(f)
+    }
+}
+
 impl From<u32> for Id {
     fn from(n: u32) -> Self {
         Id::from_u32(n)