more helpful error message for incorrect c account size

Author: majabbour

program/rust/src/time_machine_types.rs

@@ -15,6 +15,8 @@ fn c_time_machine_size_is_correct() {
     assert_eq!(
         ::std::mem::size_of::<TimeMachineWrapper>(),
         c_oracle_header::TIME_MACHINE_STRUCT_SIZE.try_into().unwrap(),
-        "expected TIME_MACHINE_STRUCT_SIZE in oracle.h to the same as the size of TimeMachineWrapper"
+        "expected TIME_MACHINE_STRUCT_SIZE ({}) in oracle.h to the same as the size of TimeMachineWrapper ({})",
+        c_oracle_header::TIME_MACHINE_STRUCT_SIZE,
+        ::std::mem::size_of::<TimeMachineWrapper>()
     );
 }