fmt.Fprintf(os.Stderr, "gofmt: %s: error restoring file to original: %v; backup in %s\n", filename, err, bakname)
	}

	n, err := fout.Write(formatted)
	if err == nil && int64(n) < size {
		err = fout.Truncate(int64(n))
	}

	if err != nil {
		// Rewriting the file failed.

		if n == 0 {
			// Original file unchanged.
			os.Remove(bakname)
			return err
		}

// securityPreservingHTTPClient returns a client that is like the original
// but rejects redirects to plain-HTTP URLs if the original URL was secure.
func securityPreservingHTTPClient(original *http.Client) *http.Client {
	c := new(http.Client)
	*c = *original
	c.CheckRedirect = func(req *http.Request, via []*http.Request) error {

	handled bool
	err     error

	original func(dst, src *poll.FD, remain int64) (int64, bool, error)
}

func (h *spliceFileHook) install() {
	h.original = *PollSpliceFile
	*PollSpliceFile = func(dst, src *poll.FD, remain int64) (int64, bool, error) {
		h.called = true
		h.dstfd = dst.Sysfd
		h.srcfd = src.Sysfd
		h.remain = remain
		h.written, h.handled, h.err = h.original(dst, src, remain)

	s := Collect(seq)
	SortFunc(s, cmp)
	return s
}

// SortedStableFunc collects values from seq into a new slice.
// It then sorts the slice while keeping the original order of equal elements,
// using the comparison function to compare elements.
// It returns the new slice.
func SortedStableFunc[E any](seq iter.Seq[E], cmp func(E, E) int) []E {
	s := Collect(seq)
	SortStableFunc(s, cmp)

		if err != nil {
			t.Errorf("%s: failed to marshal into PKCS#8: %s", test.name, err)
			continue
		}
		if !bytes.Equal(derBytes, reserialised) {
			t.Errorf("%s: marshaled PKCS#8 didn't match original: got %x, want %x", test.name, reserialised, derBytes)
			continue
		}

		if ecKey, isEC := privKey.(*ecdsa.PrivateKey); isEC {
			ecdhKey, err := ecKey.ECDH()
			if err != nil {

// the same Func Object as the original method. See also go.dev/issue/34421.
func TestEmbeddedMethod(t *testing.T) {
	const src = `package p; type I interface { error }`
	pkg := mustTypecheck(src, nil, nil)

	// get original error.Error method
	eface := Universe.Lookup("error")
	orig, _, _ := LookupFieldOrMethod(eface.Type(), false, nil, "Error")
	if orig == nil {
		t.Fatalf("original error.Error not found")
	}

in practice any release ≥ Go 1.20.6 but < Go 1.x will work as the bootstrap base.
Releases ≥ Go 1.x are very likely to work as well.

See https://go.dev/s/go15bootstrap for more details about the original bootstrap

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

package net

import "internal/poll"

var (
	// Placeholders for saving original socket system calls.
	origWSASocket   = wsaSocketFunc
	origClosesocket = poll.CloseFunc
	origConnect     = connectFunc
	origConnectEx   = poll.ConnectExFunc
	origListen      = listenFunc

func f(F[int])      {}
func g[T any](F[T]) {}

func _() {
	g(f /* ERROR "type func(F[int]) of f does not match F[T] (cannot infer T)" */) // type inference/unification must not panic
}

// original test case from issue

type List[T any] func(T, func(T, List[T]) T) T

func nil[T any](n T, _ List[T]) T        { return n }

		}
		// If the original block contained u = φ(u0, u1, ..., un) and
		// the current phi is
		//    v = φ(v0, v1, ..., u, ..., vk)
		// then the merged phi is
		//    v = φ(v0, v1, ..., u0, ..., vk, u1, ..., un)
		v.SetArg(i, u.Args[0])
		v.AddArgs(u.Args[1:]...)
	} else {
		// If the original block contained u = φ(u0, u1, ..., un) and
		// the current phi is