golang.org/x/tools v0.22.0

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 pkg:golang/golang.org/x/tools@v0.22.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/tools@v0.22.0

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:sha256:1542a09e372d414dd865aeed54597d56499005bf6bde58693d9f7cd4d62b0591","contract":["inspector.New constructs an Inspector from parsed AST files for node filtering and traversal","inspector.Preorder traverses AST nodes in preorder filtering by specific node types","inspector.WithStack traverses AST nodes maintaining the ancestor stack and allowing branch control","intsets.Sparse performs insertion, membership testing, union, and difference operations on sparse integer sets","analysis.Analyzer defines a modular static analysis pass with metadata and execution function"],"goal":"verify pkg:golang/golang.org/x/tools@v0.22.0","kind":"HOW","packages":["pkg:golang/golang.org/x/tools@v0.22.0"],"schemaVersion":1},"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/tools@v0.22.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/tools@v0.22.0","verifierAdapter":"golang@1"}

module sample-golang-tools

go 1.23.0

require golang.org/x/tools v0.22.0

golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=

package main

import (
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"

	"golang.org/x/tools/container/intsets"
	"golang.org/x/tools/go/analysis"
	"golang.org/x/tools/go/ast/inspector"
)

func main() {
	// Demonstrate inspector.New and inspector.Preorder
	src := `package main
func hello() {
	println("hello")
}
func world() {
	println("world")
}
`
	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "example.go", src, 0)
	if err == nil {
		inspect := inspector.New([]*ast.File{f})
		var funcs []string
		inspect.Preorder([]ast.Node{(*ast.FuncDecl)(nil)}, func(n ast.Node) {
			if fn, ok := n.(*ast.FuncDecl); ok && fn.Name != nil {
				funcs = append(funcs, fn.Name.Name)
			}
		})
		fmt.Printf("Inspector detected functions: %v\n", funcs)
	}

	// Demonstrate intsets.Sparse
	var s intsets.Sparse
	s.Insert(42)
	s.Insert(100)
	fmt.Printf("Sparse set length: %d, contains 42: %v\n", s.Len(), s.Has(42))

	// Demonstrate analysis.Analyzer
	analyzer := &analysis.Analyzer{
		Name: "sampleanalyzer",
		Doc:  "verifies AST structure",
		Run: func(pass *analysis.Pass) (interface{}, error) {
			return nil, nil
		},
	}
	fmt.Printf("Analyzer: %s (%s)\n", analyzer.Name, analyzer.Doc)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/tools@v0.22.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/tools@v0.22.0"
  ]
}

package main

import (
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"
	"os"

	"golang.org/x/tools/container/intsets"
	"golang.org/x/tools/go/analysis"
	"golang.org/x/tools/go/ast/inspector"
)

func main() {
	// Assertion 1: inspector.New constructs an Inspector from parsed AST files for node filtering and traversal
	src := `package sample
import "fmt"
func hello() {
	fmt.Println("hello")
}
func world() {
	fmt.Println("world")
}
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "sample.go", src, 0)
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: parser.ParseFile failed: %v\n", err)
		os.Exit(1)
	}

	inspect := inspector.New([]*ast.File{file})
	if inspect == nil {
		fmt.Fprintln(os.Stderr, "FAIL: inspector.New returned nil")
		os.Exit(1)
	}

	// Assertion 2: inspector.Preorder traverses AST nodes in preorder filtering by specific node types
	var funcNames []string
	inspect.Preorder([]ast.Node{(*ast.FuncDecl)(nil)}, func(n ast.Node) {
		fn, ok := n.(*ast.FuncDecl)
		if ok && fn.Name != nil {
			funcNames = append(funcNames, fn.Name.Name)
		}
	})

	if len(funcNames) != 2 || funcNames[0] != "hello" || funcNames[1] != "world" {
		fmt.Fprintf(os.Stderr, "FAIL: inspector.Preorder unexpected func names: %v\n", funcNames)
		os.Exit(1)
	}

	// Assertion 3: inspector.WithStack traverses AST nodes maintaining the ancestor stack and allowing branch control
	var stackDepthAtCall int
	inspect.WithStack([]ast.Node{(*ast.CallExpr)(nil)}, func(n ast.Node, push bool, stack []ast.Node) bool {
		if push {
			stackDepthAtCall++
			if len(stack) == 0 {
				fmt.Fprintln(os.Stderr, "FAIL: inspector.WithStack stack is empty on push")
				os.Exit(1)
			}
		}
		return true
	})

	if stackDepthAtCall != 2 {
		fmt.Fprintf(os.Stderr, "FAIL: inspector.WithStack expected 2 call expressions, got %d\n", stackDepthAtCall)
		os.Exit(1)
	}

	// Assertion 4: intsets.Sparse performs insertion, membership testing, union, and difference operations on sparse integer sets
	{
		var a, b intsets.Sparse
		a.Insert(1)
		a.Insert(100)
		a.Insert(10000)

		if !a.Has(100) || a.Has(200) {
			fmt.Fprintln(os.Stderr, "FAIL: intsets.Sparse Has failed")
			os.Exit(1)
		}
		if a.Len() != 3 {
			fmt.Fprintf(os.Stderr, "FAIL: intsets.Sparse Len expected 3, got %d\n", a.Len())
			os.Exit(1)
		}

		b.Insert(100)
		b.Insert(500)

		var union intsets.Sparse
		union.Copy(&a)
		union.UnionWith(&b)
		if union.Len() != 4 || !union.Has(500) || !union.Has(1) {
			fmt.Fprintf(os.Stderr, "FAIL: intsets.Sparse UnionWith failed, len=%d\n", union.Len())
			os.Exit(1)
		}

		var diff intsets.Sparse
		diff.Copy(&a)
		diff.DifferenceWith(&b)
		if diff.Len() != 2 || diff.Has(100) || !diff.Has(10000) {
			fmt.Fprintf(os.Stderr, "FAIL: intsets.Sparse DifferenceWith failed, len=%d\n", diff.Len())
			os.Exit(1)
		}
	}

	// Assertion 5: analysis.Analyzer defines a modular static analysis pass with metadata and execution function
	{
		ran := false
		analyzer := &analysis.Analyzer{
			Name: "testanalyzer",
			Doc:  "verifies test analyzer contract",
			Run: func(pass *analysis.Pass) (interface{}, error) {
				ran = true
				return "ok", nil
			},
		}

		if analyzer.Name != "testanalyzer" || analyzer.Doc != "verifies test analyzer contract" {
			fmt.Fprintln(os.Stderr, "FAIL: analysis.Analyzer fields mismatch")
			os.Exit(1)
		}

		res, err := analyzer.Run(nil)
		if err != nil || !ran || res != "ok" {
			fmt.Fprintf(os.Stderr, "FAIL: analysis.Analyzer Run failed: ran=%v, res=%v, err=%v\n", ran, res, err)
			os.Exit(1)
		}
	}

	fmt.Println("PASS: pkg:golang/golang.org/x/tools@v0.22.0 contract passed")
}