1 files changed, 15 insertions, 0 deletions
diff --git a/rust/qemu-api/src/assertions.rs b/rust/qemu-api/src/assertions.rs
index bba38cfda1..eb12e9499a 100644
--- a/rust/qemu-api/src/assertions.rs
+++ b/rust/qemu-api/src/assertions.rs
@@ -91,6 +91,21 @@ macro_rules! assert_field_type {
             }
         };
     };
+
+    ($t:ty, $i:tt, $ti:ty, num = $num:ident) => {
+        const _: () = {
+            #[allow(unused)]
+            fn assert_field_type(v: $t) {
+                fn types_must_be_equal<T, U>(_: T)
+                where
+                    T: $crate::assertions::EqType<Itself = U>,
+                {
+                }
+                let index: usize = v.$num.try_into().unwrap();
+                types_must_be_equal::<_, &$ti>(&v.$i[index]);
+            }
+        };
+    };
 }
 
 /// Assert that an expression matches a pattern.  This can also be