retnilnil is a static analysis tool for Golang that detects return nil, nil in functions with (*T, error) as the return type.

func f() (*T, error) {
	return nil, nil // retnilnil detects this
}

retnilnil ignores a code which has an ignore comment.

func f() (*T, error) {
	//lint:ignore retnilnil reason
	return nil, nil // retnilnil doesn't detect this
}

retnilnil also ignores a function that has a comment includes nil, nil.

// f always returns `nil, nil`
func f() (*T, error) {
	return nil, nil // retnilnil doesn't detect this
}

You can get retnilnil by go install command (Go 1.16 and higher).

$ go install github.com/neglect-yp/retnilnil/cmd/[email protected]

$ retnilnil ./...