message: Make DynFunc::func_index private.
diff: @@ -434,7 +434,7 @@ pub struct DynFunc<'a> {
  pub(crate) signature: Arc<FuncSig>,
  module: &'a ModuleInner,
  pub(crate) instance_inner: &'a InstanceInner,
  - pub func_index: FuncIndex,
  + func_index: FuncIndex,
  }
  impl<'a> DynFunc<'a> {
  