err = os.WriteFile(mod, []byte("module lldbtest"), 0644)
	if err != nil {
		t.Fatalf("failed to create mod file: %v", err)
	}

	// As of 2018-07-17, lldb doesn't support compressed DWARF, so
	// disable it for this test.
	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags=all=-N -l", "-ldflags=-compressdwarf=false", "-o", "a.exe")
	cmd.Dir = dir
	cmd.Env = append(os.Environ(), "GOPATH=") // issue 31100

//	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//	ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
//	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

	s := &Task{id: id}
	return context.WithValue(pctx, traceContextKey{}, s), s

	// We allocate a new task even when
	// the tracing is disabled because the context and task
	// can be used across trace enable/disable boundaries,
	// which complicates the problem.
	//
	// For example, consider the following scenario:
	//   - trace is enabled.
	//   - trace.WithRegion is called, so a new context ctx
	//     with a new region is created.

// syncTimer returns c as an unsafe.Pointer, for passing to newTimer.
// If the GODEBUG asynctimerchan has disabled the async timer chan
// code, then syncTimer always returns nil, to disable the special
// channel code paths in the runtime.
func syncTimer(c chan Time) unsafe.Pointer {
	// If asynctimerchan=1, we don't even tell the runtime
	// about channel timers, so that we get the pre-Go 1.23 code paths.

// pointer types, because we generate code passing a struct ptr rather
// than using the typedef. This warning is expected and does not break
// a normal build.
// We can only disable -Wincompatible-pointer-types starting with GCC 5.

// #if __GNU_MAJOR__ >= 5
//
// #pragma GCC diagnostic ignored "-Wincompatible-pointer-types"
//
// typedef struct {
// 	int a;

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

// Methods of reflect.rtype use StructOf and FuncOf which in turn depend on
// reflect.Value.Method. StructOf and FuncOf must not disable the DCE.

package main

import "reflect"

type S int

func (s S) M() { println("S.M") }

func (s S) N() { println("S.N") }

type T float64

func (t T) F(s S) {}

func useStructOf() {

package main

import (
	"runtime"
	"runtime/debug"
	"unsafe"
)

func init() {
	register("BadTraceback", BadTraceback)
}

func BadTraceback() {
	// Disable GC to prevent traceback at unexpected time.
	debug.SetGCPercent(-1)
	// Out of an abundance of caution, also make sure that there are
	// no GCs actively in progress.
	runtime.GC()

package main

import (
	"bytes"
	"fmt"
	"log"
	"net/http"
	"net/http/pprof"
	"net/http/httptest"
	"runtime"
)

func main() {
	// Disable the mutex profiler. This is the default, but that default is
	// load-bearing for this test, which needs the base profile to be empty.
	runtime.SetMutexProfileFraction(0)

	h := pprof.Handler("mutex")

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package x86

)

func init() {
	register("AsyncPreempt", AsyncPreempt)
}

func AsyncPreempt() {
	// Run with just 1 GOMAXPROCS so the runtime is required to
	// use scheduler preemption.
	runtime.GOMAXPROCS(1)
	// Disable GC so we have complete control of what we're testing.
	debug.SetGCPercent(-1)
	// Out of an abundance of caution, also make sure that there are
	// no GCs actively in progress. The sweep phase of a GC cycle