code: func SegmentGenericBegin(id, parent int64, name string) (int64, error) {
  	cname := C.CString(name)
  	defer C.free(unsafe.Pointer(cname))
  
  	return errNoLong(C.newrelic_segment_generic_begin(C.long(id), C.long(parent), cname))
  }
docs: /*
   * Identify the beginning of a segment that performs a generic operation. This
   * type of segment does not create metrics, but can show up in a transaction
   * trace if a transaction is slow enough.
   *
   * @param transaction_id  id of transaction
   * @param parent_segment_id  id of parent segment
   * @param name  name to represent segment
   * @return  segment id on success, else negative warning code or error code
   */