// the authentication attempt and closes the connection.
	Start(server *ServerInfo) (proto string, toServer []byte, err error)

	// Next continues the authentication. The server has just sent
	// the fromServer data. If more is true, the server expects a
	// response, which Next should return as toServer; otherwise
	// Next should return toServer == nil.
	// If Next returns a non-nil error, the SMTP client aborts

// zero bytes for "toServer" so we can test that we don't send spaces at
// the end of the line. See TestClientAuthTrimSpace.
type toServerEmptyAuth struct{}

func (toServerEmptyAuth) Start(server *ServerInfo) (proto string, toServer []byte, err error) {
	return "FOOAUTH", nil, nil
}

func (toServerEmptyAuth) Next(fromServer []byte, more bool) (toServer []byte, err error) {
	panic("unexpected call")
}

# (For now, exactly eight.)
! go list -m vcs-test.golang.org/auth/ormanylines@latest
stderr '\tserver response:\n(.|\n)*\tline 8\n\t\[Truncated: too many lines.\]$'

# Server responses should be truncated to some reasonable number of characters.
! go list -m vcs-test.golang.org/auth/oronelongline@latest
! stderr 'blah{40}'
stderr '\tserver response: \[Truncated: too long\.\]$'

env GOSUMDB=off
env GOVCS='*:off'

# Without credentials, downloading a module from a path that requires HTTPS
# basic auth should fail.
env NETRC=$WORK/empty
! go mod tidy
stderr '^\tserver response: ACCESS DENIED, buddy$'
stderr '^\tserver response: File\? What file\?$'

# With credentials from a netrc file, it should succeed.
env NETRC=$WORK/netrc
go mod tidy
go list all
stdout vcs-test.golang.org/auth/or401

// and 1 if "v" is greater than "other".
func (v IstioVersion) Compare(other IstioVersion) int {
	ver := model.ParseIstioVersion(string(v))
	otherVer := model.ParseIstioVersion(string(other))
	return ver.Compare(otherVer)
}

// Minimum returns the minimum from a set of IstioVersions
// returns empty value if no versions.
func (v IstioVersions) Minimum() IstioVersion {
	if len(v) == 0 {

! go get example.net/emptysubdir/subdir/...
! stderr 'matched no packages'
stderr '^go: example\.net/emptysubdir/subdir/\.\.\.: module example\.net/emptysubdir/subdir: reading http://.*: 404 Not Found\n\tserver response: 404 page not found\n\z'

# It doesn't make sense to 'go get' a path in the standard library,
# since the standard library necessarily can't have unresolved imports.
#

cd m
cp go.mod go.mod.orig
! go list -m all
stderr '^go: example.com/cmd@v1.1.0-doesnotexist: reading http.*/mod/example\.com/cmd/@v/v1.1.0-doesnotexist.info: 404 Not Found\n\tserver response: 404 page not found$'
stderr '^go: example.com/cmd@v1.1.0-doesnotexist: missing go.sum entry for go.mod file; to add it:\n\tgo mod download example.com/cmd$'
go run example.com/cmd/a@v1.0.0
stdout '^a@v1.0.0$'

)

func (e *HTTPError) Error() string {
	if e.Detail != "" {
		detailSep := " "
		if strings.ContainsRune(e.Detail, '\n') {
			detailSep = "\n\t"
		}
		return fmt.Sprintf("reading %s: %v\n\tserver response:%s%s", e.URL, e.Status, detailSep, e.Detail)
	}

	if eErr := e.Err; eErr != nil {
		if pErr, ok := e.Err.(*fs.PathError); ok {
			if u, err := url.Parse(e.URL); err == nil {

cd m
cp go.mod go.mod.orig
! go list -m all
stderr '^go: example.com/cmd@v1.1.0-doesnotexist: reading http.*/mod/example.com/cmd/@v/v1.1.0-doesnotexist.info: 404 Not Found\n\tserver response: 404 page not found$'
stderr '^go: example.com/cmd@v1.1.0-doesnotexist: missing go.sum entry for go.mod file; to add it:\n\tgo mod download example.com/cmd$'
go install example.com/cmd/a@latest
cmp go.mod go.mod.orig

      "integrity": "sha512-cW9T5W9xY37cc+jfEnaUvX91foxtHkza3Nw3wkoF4sSlKn0MONdkdEndig/qPBWXNkmplh3NzayQzCiHM4/hqw==",
      "dev": true,
      "bin": {
        "tsc": "bin/tsc",
        "tsserver": "bin/tsserver"
      },
      "engines": {
        "node": ">=12.20"
      }
    },
    "node_modules/unbox-primitive": {
      "version": "1.0.2",