Go Error-Result pattern example

result.go

type Result[T any] struct {
   //...
}
// NewResult for a value.
func NewResult[T any](t T) *Result[T] {...}

// NewResultError creates a Result from a value, error tuple.
func NewResultError[T any](t T, err error) *Result[T] {...}

// NewError for an error.
func NewError[T any](err error) *Result[T] {...}

func (r *Result[T]) Ok() bool {...}

func (r *Result[T]) Error() error {...}

func (r *Result[T]) OrEmpty() T {...}

func Map[T, R any](t *Result[T], transform func(t T) *Result[R]) * Result[R] {...}

func MapError[T, R any](t *Result[T]) *genfuncs.Result[R] {...}

// See genfuncs for full implementation