golang.org/x/text v0.43.0: language.Make

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/text/language.Make in pkg:golang/golang.org/x/text@v0.43.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/text@v0.43.0
Demonstrate these symbols/APIs:
  - golang.org/x/text/language.Make

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:55832e895353b9b9d049cf96c70e081e3d24d9eb1ab6c029d4f1d46f8073c083","contract":["language.Make creates a Tag from a valid BCP 47 language tag string like \"en-US\"","language.Make produces a Tag matching the result of language.Parse for valid tags","language.Make canonicalizes casing such that \"EN-us\" produces \"en-US\"","language.Make returns language.Und when passed an empty string","language.Make returns a best-effort tag without panicking on ill-formed input","language.Make correctly extracts base language and region components from the parsed tag"],"goal":"verify golang.org/x/text/language.Make in pkg:golang/golang.org/x/text@v0.43.0","kind":"HOW","packages":["pkg:golang/golang.org/x/text@v0.43.0"],"schemaVersion":1,"symbols":["golang.org/x/text/language.Make"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/text@v0.43.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/text@v0.43.0","symbols":["golang.org/x/text/language.Make"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.0

require golang.org/x/text v0.43.0

golang.org/x/text v0.43.0 h1:1QivrlhwAsnMOcqgOdl9my7s9OyZl8O5/UGUTJVXoWc=
golang.org/x/text v0.43.0/go.mod h1:hbSIYA/amXcRXTFSZqh8tWHEoqRvvbKPJ2uz/KU+a+s=

package main

import (
	"fmt"

	"golang.org/x/text/language"
)

func main() {
	enUS := language.Make("en-US")
	fmt.Printf("Tag: %s\n", enUS.String())

	base, conf := enUS.Base()
	fmt.Printf("Base: %s (%v)\n", base, conf)

	region, rConf := enUS.Region()
	fmt.Printf("Region: %s (%v)\n", region, rConf)

	und := language.Make("")
	fmt.Printf("Empty: %s (root: %v)\n", und.String(), und.IsRoot())
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/text/language.Make in pkg:golang/golang.org/x/text@v0.43.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/text@v0.43.0"
  ],
  "symbols": [
    "golang.org/x/text/language.Make"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/text/language"
)

func main() {
	// 1. language.Make creates a Tag from a valid BCP 47 language tag string like "en-US"
	enUS := language.Make("en-US")
	if enUS.String() != "en-US" {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected \"en-US\", got %q\n", enUS.String())
		os.Exit(1)
	}

	// 2. language.Make produces a Tag matching the result of language.Parse for valid tags
	parsed, err := language.Parse("en-US")
	if err != nil {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: language.Parse returned error: %v\n", err)
		os.Exit(1)
	}
	if enUS != parsed {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: Make(\"en-US\") != Parse(\"en-US\"): %v vs %v\n", enUS, parsed)
		os.Exit(1)
	}

	// 3. language.Make canonicalizes casing such that "EN-us" produces "en-US"
	cased := language.Make("EN-us")
	if cased.String() != "en-US" {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected canonicalized \"en-US\", got %q\n", cased.String())
		os.Exit(1)
	}
	if cased != enUS {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected cased tag to equal enUS\n")
		os.Exit(1)
	}

	// 4. language.Make returns language.Und when passed an empty string
	und := language.Make("")
	if und != language.Und {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected language.Und for empty string, got %v\n", und)
		os.Exit(1)
	}
	if und.String() != "und" || !und.IsRoot() {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected String() == \"und\" and IsRoot() == true\n")
		os.Exit(1)
	}

	// 5. language.Make returns a best-effort tag without panicking on ill-formed input
	illFormed := language.Make("---ill-formed---")
	_ = illFormed.String()

	// 6. language.Make correctly extracts base language and region components from the parsed tag
	frCA := language.Make("fr-CA")
	base, bConf := frCA.Base()
	if base.String() != "fr" || bConf != language.Exact {
		fmt.Fprintf(os.Stderr, "assertion 6 failed: expected base \"fr\" with Exact confidence, got %q (%v)\n", base.String(), bConf)
		os.Exit(1)
	}
	region, rConf := frCA.Region()
	if region.String() != "CA" || rConf != language.Exact {
		fmt.Fprintf(os.Stderr, "assertion 6 failed: expected region \"CA\" with Exact confidence, got %q (%v)\n", region.String(), rConf)
		os.Exit(1)
	}

	fmt.Println("All contract assertions passed.")
}