variable.
Test names are defined as the name of the `.go` file that generates the
trace, but with the `.go` extension removed.

## Trace test programs

The trace test programs in the `testprog` directory generate traces to
stdout.
Otherwise they're just normal programs.

## Trace debug commands

The `cmd` directory contains helpful tools for debugging traces.

		"CoroLockOSThreadLockAfterPull",
		"CoroLockOSThreadStopLocked",
		"CoroLockOSThreadStopLockedIterNested",
	} {
		t.Run(test, func(t *testing.T) {
			checkCoroTestProgOutput(t, runTestProg(t, "testprog", test))
		})
	}
}

func TestCoroCgoCallback(t *testing.T) {
	testenv.MustHaveCGO(t)
	if runtime.GOOS == "windows" {
		t.Skip("coro cgo callback tests not supported on Windows")
	}

		{"panicCustomUint64", `panic: main.MyUint64(93)`},
		{"panicCustomUintptr", `panic: main.MyUintptr(93)`},
	}

	for _, tt := range tests {
		t := t
		t.Run(tt.name, func(t *testing.T) {
			output := runTestProg(t, "testprog", tt.name)
			if !strings.HasPrefix(output, tt.wantPanicPrefix) {
				t.Fatalf("%q\nis not present in\n%s", tt.wantPanicPrefix, output)
			}
		})
	}

	"fmt"
	"internal/trace/raw"
	"internal/trace/version"
	"io"
	"log"
	"os"
	"os/exec"
)

func main() {
	// Create command.
	var trace, stderr bytes.Buffer
	cmd := exec.Command("go", "run", "./testprog/main.go")
	cmd.Stdout = &trace
	cmd.Stderr = &stderr

	// Run trace program; the trace will appear in stdout.
	fmt.Fprintln(os.Stderr, "running trace program...")
	if err := cmd.Run(); err != nil {

		t.Skip("asynchronous preemption not supported on this platform")
	}
	output := runTestProg(t, "testprog", "AsyncPreempt")
	want := "OK\n"
	if output != want {
		t.Fatalf("want %s, got %s\n", want, output)
	}
}

func TestGCFairness(t *testing.T) {
	output := runTestProg(t, "testprog", "GCFairness")
	want := "OK\n"
	if output != want {
		t.Fatalf("want %s, got %s\n", want, output)
	}
}

)

func TestGcSys(t *testing.T) {
	t.Skip("skipping known-flaky test; golang.org/issue/37331")
	if os.Getenv("GOGC") == "off" {
		t.Skip("skipping test; GOGC=off in environment")
	}
	got := runTestProg(t, "testprog", "GCSys")
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestGcDeepNesting(t *testing.T) {
	type T [2][2][2][2][2][2][2][2][2][2]*int
	a := new(T)

		// affect this test and this is itself a test of a debug mode, it's not
		// a high priority.
		testenv.SkipFlaky(t, 55160)
	}

	exe, err := buildTestProg(t, "testprog")
	if err != nil {
		t.Fatal(err)
	}

	cmd := testenv.Command(t, exe, "CrashDumpsAllThreads")
	cmd = testenv.CleanCmdEnv(cmd)
	cmd.Dir = t.TempDir() // put any core file in tempdir
	cmd.Env = append(cmd.Env,

func TestDebugLogBuild(t *testing.T) {
	testenv.MustHaveGoBuild(t)

	// It doesn't matter which program we build, anything will rebuild the
	// runtime.
	if _, err := buildTestProg(t, "testprog", "-tags=debuglog"); err != nil {
		t.Fatal(err)
	}

	}
}

func TestTracebackAncestors(t *testing.T) {
	goroutineRegex := regexp.MustCompile(`goroutine [0-9]+ \[`)
	for _, tracebackDepth := range []int{0, 1, 5, 50} {
		output := runTestProg(t, "testprog", "TracebackAncestors", fmt.Sprintf("GODEBUG=tracebackancestors=%d", tracebackDepth))

		numGoroutines := 3
		numFrames := 2
		ancestorsExpected := numGoroutines
		if numGoroutines > tracebackDepth {

	testenv.MustHaveGoRun(t)

	tmpdir := t.TempDir()

	src := filepath.Join(tmpdir, "a.go")
	file, err := os.Create(src)
	if err != nil {
		t.Fatal(err)
	}
	err = template.Must(template.New("main").Parse(testprog)).Execute(file, linktype != linkNoCgo)
	if err != nil {
		if err := file.Close(); err != nil {
			t.Error(err)
		}
		t.Fatal(err)
	}
	if err := file.Close(); err != nil {
		t.Fatal(err)
	}