spanHasSpecials(span)
	} else {
		rec = (*specialPinCounter)(unsafe.Pointer(*ref))
	}
	rec.counter++
}

// decPinCounter decreases the counter. If the counter reaches 0, the counter
// special is deleted and false is returned. Otherwise true is returned.
func (span *mspan) decPinCounter(offset uintptr) bool {
	ref, exists := span.specialFindSplicePoint(offset, _KindSpecialPinCounter)
	if !exists {