error: Only methods allowed in RPC traits
 --> $DIR/rpc_assoc_items.rs:6:2
  |
6 |     const WOO: usize;
  |     ^^^^^^^^^^^^^^^^^

error: Only methods allowed in RPC traits
  --> $DIR/rpc_assoc_items.rs:14:2
   |
14 |     type Woo;
   |     ^^^^^^^^^