if os.IsNotExist(err) {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}
	if !fd.IsDir() {
		return nil, fmt.Errorf("debug path %q is not a directory", debugDir)
	}
	info, ok := debug.ReadBuildInfo()
	if !ok {
		return nil, fmt.Errorf("no build info")
	}
	year, month, day := time.Now().UTC().Date()
	goVers := info.GoVersion
	// E.g.,  goVers:"go1.22-20240109-RC01 cl/597041403 +dcbe772469 X:loopvar"

-- needmod/needmod.go --
//go:generate touch gen.txt

package main

import (
	"fmt"
	"os"
	"runtime/debug"

	_ "example.com/version"
)

func main() {
	info, ok := debug.ReadBuildInfo()
	if !ok {
		panic("missing build info")
	}
	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
	for _, m := range info.Deps {

		return true, nil
	default:
		return false, fmt.Errorf("unexpected error reading file when determining case-sensitivity: %w", err)
	}
}

func isTrimpath() (bool, error) {
	info, _ := debug.ReadBuildInfo()
	if info == nil {
		return false, errors.New("missing build info")
	}

	for _, s := range info.Settings {
		if s.Key == "-trimpath" && s.Value == "true" {
			return true, nil
		}
	}

-- $WORK/auto/vendor/example.com/printversion/printversion.go --
package main

import (
	"fmt"
	"os"
	"runtime/debug"

	_ "example.com/version"
)

func main() {
	info, _ := debug.ReadBuildInfo()
	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
	for _, m := range info.Deps {
		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)

// about how it was built. This includes the Go toolchain version, and the
// set of modules used (for binaries built in module mode).
//
// Build information is available for the currently running binary in
// runtime/debug.ReadBuildInfo.
package buildinfo

import (
	"bytes"
	"debug/elf"
	"debug/macho"
	"debug/pe"
	"debug/plan9obj"
	"encoding/binary"
	"errors"
	"fmt"
	"internal/saferio"
	"internal/xcoff"
	"io"

pkg reflect, method (*MapIter) Next() bool
pkg reflect, method (*MapIter) Value() Value
pkg reflect, method (Value) MapRange() *MapIter
pkg reflect, type MapIter struct
pkg runtime/debug, func ReadBuildInfo() (*BuildInfo, bool)
pkg runtime/debug, type BuildInfo struct
pkg runtime/debug, type BuildInfo struct, Deps []*Module
pkg runtime/debug, type BuildInfo struct, Main Module
pkg runtime/debug, type BuildInfo struct, Path string

var (
	errNoBuildInfo = errors.New("counter: missing build info")
	errCorrupt     = errors.New("counter: corrupt counter file")
)

func (f *file) init(begin, end time.Time) {
	info, ok := debug.ReadBuildInfo()
	if !ok {
		f.err = errNoBuildInfo
		return
	}
	if mode, _ := telemetry.Default.Mode(); mode == "off" {
		f.err = ErrDisabled
		return
	}
	dir := telemetry.Default.LocalDir()

// in the binary. setBuildInfo should only be called on a main package with no
// errors.
//
// This information can be retrieved using debug.ReadBuildInfo.
//
// Note that the GoVersion field is not set here to avoid encoding it twice.
// It is stored separately in the binary, mostly for historical reasons.

		{"Module.Path", Field, 12},
		{"Module.Replace", Field, 12},
		{"Module.Sum", Field, 12},
		{"Module.Version", Field, 12},
		{"ParseBuildInfo", Func, 18},
		{"PrintStack", Func, 0},
		{"ReadBuildInfo", Func, 12},
		{"ReadGCStats", Func, 1},
		{"SetGCPercent", Func, 1},
		{"SetMaxStack", Func, 2},
		{"SetMaxThreads", Func, 2},
		{"SetMemoryLimit", Func, 19},
		{"SetPanicOnFault", Func, 3},