golang.org/x/mod v0.39.0: module.Version

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/mod/module.Version in pkg:golang/golang.org/x/mod@v0.39.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/mod@v0.39.0
Demonstrate these symbols/APIs:
  - golang.org/x/mod/module.Version
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

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:sha256:29fc10c708beaff2e0206eaf6f6c2c687eb007a7e325303da9c8f92ee8c84ff5","contract":["module.Version has Path and Version fields","module.Version.String() returns \"path@version\" when version is non-empty","module.Version.String() returns \"path\" when version is empty","module.Version instances support equality comparison","module.Sort sorts module.Version slices by path and semantic version"],"goal":"verify golang.org/x/mod/module.Version in pkg:golang/golang.org/x/mod@v0.39.0","kind":"HOW","packages":["pkg:golang/golang.org/x/mod@v0.39.0"],"schemaVersion":1,"symbols":["golang.org/x/mod/module.Version"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/mod@v0.39.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/mod@v0.39.0","symbols":["golang.org/x/mod/module.Version"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require golang.org/x/mod v0.39.0

golang.org/x/mod v0.39.0 h1:UF5zwQdCRRUpHfyPwr7d4UrGiVeldIsogtzWVnczL74=
golang.org/x/mod v0.39.0/go.mod h1:bvIbwjQ0HUFFf5AKukeeYQG4ZBUG9yxQbR9aEweIwYY=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/mod/module.Version in pkg:golang/golang.org/x/mod@v0.39.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/mod@v0.39.0"
  ],
  "symbols": [
    "golang.org/x/mod/module.Version"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/mod/module"
	"sample"
)

func main() {
	// Assertion 1: module.Version field assignment and values
	v1 := module.Version{Path: "example.com/mod", Version: "v1.2.3"}
	if v1.Path != "example.com/mod" {
		fmt.Fprintf(os.Stderr, "expected Path 'example.com/mod', got %q\n", v1.Path)
		os.Exit(1)
	}
	if v1.Version != "v1.2.3" {
		fmt.Fprintf(os.Stderr, "expected Version 'v1.2.3', got %q\n", v1.Version)
		os.Exit(1)
	}

	// Assertion 2: module.Version.String() formats as "path@version" when version is non-empty
	if v1.String() != "example.com/mod@v1.2.3" {
		fmt.Fprintf(os.Stderr, "expected String() 'example.com/mod@v1.2.3', got %q\n", v1.String())
		os.Exit(1)
	}

	// Assertion 3: module.Version.String() returns only path when version is empty
	vEmpty := module.Version{Path: "example.com/mod", Version: ""}
	if vEmpty.String() != "example.com/mod" {
		fmt.Fprintf(os.Stderr, "expected String() 'example.com/mod', got %q\n", vEmpty.String())
		os.Exit(1)
	}

	// Assertion 4: Helper NewVersion and FormatVersion
	vCreated := sample.NewVersion("example.com/lib", "v2.0.0")
	if vCreated.Path != "example.com/lib" || vCreated.Version != "v2.0.0" {
		fmt.Fprintf(os.Stderr, "unexpected NewVersion result: %+v\n", vCreated)
		os.Exit(1)
	}
	if sample.FormatVersion(vCreated) != "example.com/lib@v2.0.0" {
		fmt.Fprintf(os.Stderr, "unexpected FormatVersion result: %q\n", sample.FormatVersion(vCreated))
		os.Exit(1)
	}

	// Assertion 5: Value equality
	vSame := module.Version{Path: "example.com/mod", Version: "v1.2.3"}
	if v1 != vSame {
		fmt.Fprintf(os.Stderr, "expected v1 == vSame\n")
		os.Exit(1)
	}
	vDiff := module.Version{Path: "example.com/mod", Version: "v1.2.4"}
	if v1 == vDiff {
		fmt.Fprintf(os.Stderr, "expected v1 != vDiff\n")
		os.Exit(1)
	}

	// Assertion 6: module.Sort orders versions by path then semantic version
	list := []module.Version{
		{Path: "example.com/b", Version: "v1.0.0"},
		{Path: "example.com/a", Version: "v1.10.0"},
		{Path: "example.com/a", Version: "v1.2.0"},
	}
	sample.SortVersions(list)
	if list[0].Path != "example.com/a" || list[0].Version != "v1.2.0" {
		fmt.Fprintf(os.Stderr, "expected list[0] to be example.com/a@v1.2.0, got %s\n", list[0])
		os.Exit(1)
	}
	if list[1].Path != "example.com/a" || list[1].Version != "v1.10.0" {
		fmt.Fprintf(os.Stderr, "expected list[1] to be example.com/a@v1.10.0, got %s\n", list[1])
		os.Exit(1)
	}
	if list[2].Path != "example.com/b" || list[2].Version != "v1.0.0" {
		fmt.Fprintf(os.Stderr, "expected list[2] to be example.com/b@v1.0.0, got %s\n", list[2])
		os.Exit(1)
	}

	fmt.Println("All golang.org/x/mod/module.Version contract assertions passed.")
}

package sample

import (
	"golang.org/x/mod/module"
)

// NewVersion creates a module.Version from a module path and version string.
func NewVersion(path, version string) module.Version {
	return module.Version{
		Path:    path,
		Version: version,
	}
}

// FormatVersion returns the string representation of a module.Version.
func FormatVersion(m module.Version) string {
	return m.String()
}

// SortVersions sorts a slice of module.Version instances.
func SortVersions(list []module.Version) {
	module.Sort(list)
}