rsc.io/quote/v3 v3.1.0: Concurrency

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 rsc.io/quote/v3.Concurrency in pkg:golang/rsc.io/quote/v3@v3.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/rsc.io/quote/v3@v3.1.0
Demonstrate these symbols/APIs:
  - rsc.io/quote/v3.Concurrency

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:b650c267f982786363db8fc2eb9601dcde6657f90d145eed8f28810d844d5550","contract":["quote.Concurrency() returns \"Concurrency is not parallelism.\""],"goal":"verify rsc.io/quote/v3.Concurrency in pkg:golang/rsc.io/quote/v3@v3.1.0","kind":"HOW","packages":["pkg:golang/rsc.io/quote/v3@v3.1.0"],"schemaVersion":1,"symbols":["rsc.io/quote/v3.Concurrency"]},"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/rsc.io/quote/v3@v3.1.0"],"schemaVersion":1,"subject":"pkg:golang/rsc.io/quote/v3@v3.1.0","symbols":["rsc.io/quote/v3.Concurrency"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require rsc.io/quote/v3 v3.1.0

require (
	golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c // indirect
	rsc.io/sampler v1.3.0 // indirect
)

golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:qgOY6WgZOaTkIIMiVjBQcw93ERBE4m30iBm00nkL0i8=
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

{
  "schemaVersion": 1,
  "goal": "verify rsc.io/quote/v3.Concurrency in pkg:golang/rsc.io/quote/v3@v3.1.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/rsc.io/quote/v3@v3.1.0"
  ],
  "symbols": [
    "rsc.io/quote/v3.Concurrency"
  ]
}

package main

import (
	"fmt"
	"os"

	"rsc.io/quote/v3"
)

func main() {
	got := quote.Concurrency()
	want := "Concurrency is not parallelism."
	if got != want {
		fmt.Fprintf(os.Stderr, "quote.Concurrency() = %q, want %q\n", got, want)
		os.Exit(1)
	}
}