phase_9_79b_1: Add Unified Registry IDs + Builder Slotting\n- MIR BoxCall carries optional method_id (slot)\n- Slot registry with universal slots [0..3]\n- Builder resolves method_id when receiver type known\n- Printer shows method_id; backends updated\n- Update CURRENT_TASK + MIR spec note

src/backend/wasm/codegen.rs

@@ -404,7 +404,7 @@ impl WasmCodegen {
             },
             
             // Phase 9.77: BoxCall Implementation - Critical Box method calls
-            MirInstruction::BoxCall { dst, box_val, method, args, effects: _ } => {
+            MirInstruction::BoxCall { dst, box_val, method, args, effects: _ , .. } => {
                 self.generate_box_call(*dst, *box_val, method, args)
             },
             
@@ -713,4 +713,4 @@ mod tests {
         let result = codegen.generate_const(dst, &ConstValue::Integer(42));
         assert!(result.is_err()); // Should fail without local mapping
     }
-}
+}