# unknown Cell op
bynk.store.unknown_op
no operation `foo` — expected `update`
# wrong arity
bynk.types.call_arity
`Cell.update` takes 1 argument(s), found 0
# combiner returns the wrong type: an inline lambda checked against `(Int) -> Int`
# fails on its body type before the outer argument check, so the precise
# lambda-body diagnostic fires rather than the generic argument_mismatch.
bynk.types.lambda_mismatch
