if !strings.Contains(pkg, "/") {
			list = append(list, pkg)
		}
	}
	slices.Sort(list)

	have := strings.Join(stdPkgs, "\n") + "\n"
	want := strings.Join(list, "\n") + "\n"
	if have != want {
		t.Errorf("stdPkgs is out of date: regenerate with 'go generate'\n%s", diff.Diff("stdPkgs", []byte(have), "want", []byte(want)))
	}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Code generated by 'go generate' DO NOT EDIT.
//go:generate ./mkstd.sh

package comment

var stdPkgs = []string{
	"bufio",
	"bytes",
	"cmp",
	"context",
	"crypto",
	"embed",
	"encoding",
	"errors",
	"expvar",
	"flag",
	"fmt",
	"hash",
	"html",
	"image",
	"io",
	"iter",
	"log",

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Code generated by 'go generate' DO NOT EDIT.
//go:generate ./mkstd.sh

package comment

var stdPkgs = []string{"
go list std | grep -v / | sort | sed 's/.*/"&",/'
echo "}"

		if path, ok := d.LookupPackage(pkg); ok {
			return path, true
		}
	}
	return DefaultLookupPackage(pkg)
}

func isStdPkg(path string) bool {
	_, ok := slices.BinarySearch(stdPkgs, path)
	return ok
}

// DefaultLookupPackage is the default package lookup
// function, used when [Parser.LookupPackage] is nil.
// It recognizes names of the packages from the standard

		if err != nil {
			return false
		}
		for _, dirent := range dirents {
			if strings.HasSuffix(dirent.Name(), ".go") {
				return true
			}
		}
		return false
	case "gccgo":
		return stdpkg[path]
	default:
		panic("unknown compiler " + compiler)
	}