var golang.org/x/text/internal/language.ErrDuplicateKey

2 uses

	golang.org/x/text/internal/language (current package)
		parse.go#L39: var ErrDuplicateKey = errors.New("language: different values for same key in -u extension")
		parse.go#L549: 							scan.setError(ErrDuplicateKey)

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)