// pass 2: Printable and Worker are forward references; the rest are unknown.
// run() declares a result but its body has no return (E150). Worker also does
// not implement Printable.print (E130, pass 1).
IFC_METHOD_MISSING 1 1 PRINT IS NOT IMPLEMENTED
SEM_UNKNOWN_NAME 1 25
SEM_UNKNOWN_NAME 2 11
SEM_UNKNOWN_NAME 3 28
SEM_MISSING_RETURN 4 3
SEM_UNKNOWN_NAME 13 12