deny direct access to symmed register - prevents bugs

crsn_stacks/src/exec.rs

@@ -66,7 +66,7 @@ pub(crate) fn drop_obj(state: &mut RunState, handle: Value) -> Result<Option<()>
     Ok(stacks.store.remove(&handle).map(|_| ()))
 }
 
-fn prepare_push(mut state: &mut RunState, obj: &RdObj, src: &Rd, pushfn : impl FnOnce(&mut VecDeque<Value>, Value) -> ()) -> Result<(), Fault> {
+fn prepare_push(state: &mut RunState, obj: &RdObj, src: &Rd, pushfn : impl FnOnce(&mut VecDeque<Value>, Value) -> ()) -> Result<(), Fault> {
     state.clear_status();
     let handle = state.read_obj(*obj)?;
     let val = state.read(*src)?;