Create a simple Debug implementation for Store

crates/wasmtime/src/ref.rs

@@ -74,9 +74,10 @@ impl ExternRef {
 impl fmt::Debug for ExternRef {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let ExternRef { inner, store: _ } = self;
+        let store = self.store();
         f.debug_struct("ExternRef")
             .field("inner", &inner)
-            .field("store", &"..")
+            .field("store", &store)
             .finish()
     }
 }

crates/wasmtime/src/runtime.rs

@@ -983,6 +983,13 @@ impl Default for Store {
     }
 }
 
+impl fmt::Debug for Store {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let inner = &*self.inner as *const StoreInner;
+        f.debug_struct("Store").field("inner", &inner).finish()
+    }
+}
+
 impl Drop for StoreInner {
     fn drop(&mut self) {
         for instance in self.instances.get_mut().iter() {