/** Answer the starting line number for this block of code. */
 @Override
 @AvailMethod
 int o_StartingLineNumber(final AvailObject object) {
   final A_Atom properties = object.mutableSlot(PROPERTY_ATOM);
   final A_Number lineInteger = properties.getAtomProperty(lineNumberKeyAtom());
   return lineInteger.equalsNil() ? 0 : lineInteger.extractInt();
 }
 @Override
 @AvailMethod
 A_String o_MethodName(final AvailObject object) {
   final A_Atom propertyAtom = object.mutableSlot(PROPERTY_ATOM);
   final A_String methodName = propertyAtom.getAtomProperty(methodNameKeyAtom());
   if (methodName.equalsNil()) {
     return StringDescriptor.from("Unknown function");
   }
   return methodName;
 }