var cgoTypeSigRe = lazyregexp.New(`\b_C2?(type|func|var|macro)_\B`)

// run runs the command given by cmdline in the directory dir.
// If the command fails, run prints information about the failure
// and returns a non-nil error.
func (sh *Shell) run(dir string, desc string, env []string, cmdargs ...any) error {
	out, err := sh.runOut(dir, env, cmdargs...)
	if desc == "" {

//
// Signatures generated by this package are not deterministic, but entropy is
// mixed with the private key and the message, achieving the same level of
// security in case of randomness source failure.
//
// Operations involving private keys are implemented using constant-time
// algorithms, as long as an [elliptic.Curve] returned by [elliptic.P224],
// [elliptic.P256], [elliptic.P384], or [elliptic.P521] is used.

	if runtime.GOOS == "plan9" {
		t.Skipf("no pthreads on %s", runtime.GOOS)
	}
	got := runTestProg(t, "testprogcgo", "CgoExternalThreadPanic")
	want := "panic: BOOM"
	if !strings.Contains(got, want) {
		t.Fatalf("want failure containing %q. output:\n%s\n", want, got)
	}
}

func TestCgoExternalThreadSIGPROF(t *testing.T) {
	t.Parallel()
	// issue 9456.
	switch runtime.GOOS {
	case "plan9", "windows":

	{"012abcba210", "\xffb", 6},
	{"012\x80bcb\x80210", "\xffb", 7},
	{"0123456\xcf\x80abc", "\xcfb\x80", 10},
}

// Execute f on each test case.  funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep []byte) int, funcName string, testCases []BinOpTest) {
	for _, test := range testCases {
		a := []byte(test.a)
		b := []byte(test.b)
		actual := f(a, b)

			check.errorf(x, Test, "internal error: value of %s should be a boolean constant", x)
			return
		}
		if !constant.BoolVal(x.val) {
			check.errorf(call, Test, "%v failed", call)
			// compile-time assertion failure - safe to continue
		}
		// result is constant - no need to record signature

	case _Trace:
		// trace(x, y, z, ...) dumps the positions, expressions, and

		mast := mustParse(main)
		conf := Config{Importer: importHelper{pkg: bpkg}}
		_, err := conf.Check(mast.PkgName.Value, []*syntax.File{mast}, nil)
		if err == nil {
			t.Error("Expected failure, but it did not")
		} else if got := err.Error(); !re.MatchString(got) {
			t.Errorf("Wanted match for\n\t%s\n but got\n\t%s", want, got)
		} else if testing.Verbose() {
			t.Logf("Saw expected\n\t%s", err.Error())
		}

	unificationDepthLimit = 50

	// Whether to panic when unificationDepthLimit is reached.
	// If disabled, a recursion depth overflow results in a (quiet)
	// unification failure.
	panicAtUnificationDepthLimit = true

	// If enableCoreTypeUnification is set, unification will consider
	// the core types, if any, of non-local (unbound) type parameters.
	enableCoreTypeUnification = true

	if err != nil {
		return err
	}
	if session != nil {
		defer func() {
			// If we got a handshake failure when resuming a session, throw away
			// the session ticket. See RFC 5077, Section 3.2.
			//
			// RFC 8446 makes no mention of dropping tickets on failure, but it
			// does require servers to abort on invalid binders, so we need to
			// delete tickets to recover from a corrupted PSK.

	ip, err := ParseAddr(s)
	if err != nil {
		panic(err)
	}
	return ip
}

type parseAddrError struct {
	in  string // the string given to ParseAddr
	msg string // an explanation of the parse failure
	at  string // optionally, the unparsed portion of in at which the error occurred.
}

func (err parseAddrError) Error() string {
	q := strconv.Quote
	if err.at != "" {

	{"012abcba210", "\xffb", 6},
	{"012\x80bcb\x80210", "\xffb", 7},
	{"0123456\xcf\x80abc", "\xcfb\x80", 10},
}

// Execute f on each test case.  funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep string) int, funcName string, testCases []IndexTest) {
	for _, test := range testCases {
		actual := f(test.s, test.sep)
		if actual != test.out {