rt = ut.user
	}
	if info := lookupTypeInfo(rt); info != nil {
		return info, nil
	}
	return buildTypeInfo(ut, rt)
}

// buildTypeInfo constructs the type information for the type
// and stores it in the type info map.
func buildTypeInfo(ut *userTypeInfo, rt reflect.Type) (*typeInfo, error) {
	typeLock.Lock()
	defer typeLock.Unlock()

	if info := lookupTypeInfo(rt); info != nil {
		return info, nil
	}