Cannot invoke object with invocation handler in this context
  in any call_with_capture at src/gen/m-Metamodel.nqp:3133
  in block  at src/gen/m-CORE.setting:740
  in block  at src/gen/m-CORE.setting:4260
  in any enter at src/gen/m-Metamodel.nqp:3205
  in method invoke at src/gen/m-CORE.setting:4204
  in block <unit> at ./fibcached.p6:8