golang.org/x/net v0.24.0: atom.A

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/net/html/atom.A in pkg:golang/golang.org/x/net@v0.24.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.24.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html/atom.A

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:fc7239bda213487f26fffa280d8270de01022e52bfd0a7a765597cf2412e2a70","contract":["atom.A is a non-zero Atom constant representing the HTML anchor tag","atom.A String method returns \"a\"","atom.Lookup with byte slice \"a\" evaluates to atom.A","atom.String with byte slice \"a\" returns \"a\"","atom.A is distinct from other common tag atoms such as atom.Div, atom.Span, and atom.B","atom.Lookup on different tag bytes does not evaluate to atom.A"],"goal":"verify golang.org/x/net/html/atom.A in pkg:golang/golang.org/x/net@v0.24.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.24.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html/atom.A"]},"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/net@v0.24.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.24.0","symbols":["golang.org/x/net/html/atom.A"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.25.0

require golang.org/x/net v0.24.0

golang.org/x/net v0.24.0 h1:1PcaxkF854Fu3+lvBIx5SYn9wRlBzzcnHZSiaFFAb0w=
golang.org/x/net v0.24.0/go.mod h1:2Q7sJY5mzlzWjKtYUEXSlBWCdyaioyXzRB2RtU8KVE8=

package main

import (
	"fmt"

	"golang.org/x/net/html/atom"
)

func main() {
	// Demonstrate atom.A representing the HTML <a> tag atom
	a := atom.A
	fmt.Printf("atom.A integer: %d, string: %q\n", a, a.String())

	// Lookup 'a' atom from byte slice
	lookedUp := atom.Lookup([]byte("a"))
	fmt.Printf("atom.Lookup([]byte(\"a\")): %v, matches: %t\n", lookedUp, lookedUp == a)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.A in pkg:golang/golang.org/x/net@v0.24.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.24.0"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.A"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/net/html/atom"
)

func main() {
	// 1. atom.A is a non-zero Atom constant representing the HTML anchor tag
	if atom.A == 0 {
		fmt.Fprintf(os.Stderr, "Expected atom.A to be non-zero, got 0\n")
		os.Exit(1)
	}

	// 2. atom.A String method returns "a"
	if atom.A.String() != "a" {
		fmt.Fprintf(os.Stderr, "Expected atom.A.String() to be %q, got %q\n", "a", atom.A.String())
		os.Exit(1)
	}

	// 3. atom.Lookup with []byte("a") evaluates to atom.A
	lookedUp := atom.Lookup([]byte("a"))
	if lookedUp != atom.A {
		fmt.Fprintf(os.Stderr, "Expected atom.Lookup([]byte(\"a\")) == atom.A (%d), got %d\n", atom.A, lookedUp)
		os.Exit(1)
	}

	// 4. atom.String with []byte("a") returns "a"
	if atom.String([]byte("a")) != "a" {
		fmt.Fprintf(os.Stderr, "Expected atom.String([]byte(\"a\")) to be %q, got %q\n", "a", atom.String([]byte("a")))
		os.Exit(1)
	}

	// 5. atom.A is distinct from other common tag atoms such as atom.Div, atom.Span, and atom.B
	if atom.A == atom.Div || atom.A == atom.Span || atom.A == atom.B {
		fmt.Fprintf(os.Stderr, "Expected atom.A to be distinct from Div, Span, and B\n")
		os.Exit(1)
	}

	// 6. atom.Lookup on different tag bytes does not evaluate to atom.A
	if atom.Lookup([]byte("div")) == atom.A || atom.Lookup(nil) == atom.A {
		fmt.Fprintf(os.Stderr, "Expected atom.Lookup for other tags to not equal atom.A\n")
		os.Exit(1)
	}

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