// and then the backtracker when there are no captures.
func TestSwitchBacktrack(t *testing.T) {
	re := MustCompile(`a|b`)
	long := make([]byte, maxBacktrackVector+1)

	// The following sequence of Match calls used to panic. See issue #10319.
	re.Match(long)     // triggers standard matcher
	re.Match(long[:1]) // triggers backtracker
}

func BenchmarkFind(b *testing.B) {

	}
	re.Longest()
	if g, w := re.FindString("ab"), "ab"; g != w {
		t.Errorf("longest match was %q, want %q", g, w)
	}
}

// TestProgramTooLongForBacktrack tests that a regex which is too long
// for the backtracker still executes properly.
func TestProgramTooLongForBacktrack(t *testing.T) {

// Class to hold backtrack analysis for a results of a region. Backtrack
// analysis will trace back the definition of return values of regions through
// pass-through operations, so that the return value of the region will have the
// same value as the backtracked value.
class BacktrackAnalysisInfo {
 public:
  // Initializes the backtrack analysis for the given region.

	}
}

// checkCleanBacktrace checks that the given backtrace is well formed and does
// not contain any error messages from GDB.
func checkCleanBacktrace(t *testing.T, backtrace string) {
	backtrace = strings.TrimSpace(backtrace)
	lines := strings.Split(backtrace, "\n")
	if len(lines) == 0 {
		t.Fatalf("empty backtrace")
	}
	for i, l := range lines {

class TestOperationMapper implements BuildOperationMapper<ExecuteTestBuildOperationType.Details, DefaultTestDescriptor> {
    private final TestTaskExecutionTracker taskTracker;

    TestOperationMapper(TestTaskExecutionTracker taskTracker) {
        this.taskTracker = taskTracker;
    }

    @Override
    public boolean isEnabled(BuildEventSubscriptions subscriptions) {
        return subscriptions.isRequested(OperationType.TEST);
    }

// generations moving forward. Prefer traceEventWriter.stack.
func traceStack(skip int, gp *g, gen uintptr) uint64 {
	var pcBuf [traceStackSize]uintptr

	// Figure out gp and mp for the backtrace.
	var mp *m
	if gp == nil {
		mp = getg().m
		gp = mp.curg
	}

	// Double-check that we own the stack we're about to trace.
	if debug.traceCheckStackOwnership != 0 && gp != nil {
		status := readgstatus(gp)

	re(`-f(no-)?fast-math`),
	re(`-f(no-)?inline-functions`),
	re(`-finput-charset=([^@\-].*)`),
	re(`-f(no-)?fat-lto-objects`),
	re(`-f(no-)?keep-inline-dllexport`),
	re(`-f(no-)?lto`),
	re(`-fmacro-backtrace-limit=(.+)`),
	re(`-fmessage-length=(.+)`),
	re(`-f(no-)?modules`),
	re(`-f(no-)?objc-arc`),
	re(`-f(no-)?objc-nonfragile-abi`),
	re(`-f(no-)?objc-legacy-dispatch`),
	re(`-f(no-)?omit-frame-pointer`),

// in the caller's stack frame. These stubs write the args into that stack space and
// then tail call to the corresponding runtime handler.
// The tail call makes these stubs disappear in backtraces.
TEXT runtime·panicIndex<ABIInternal>(SB),NOSPLIT,$0-16
	JMP	runtime·goPanicIndex<ABIInternal>(SB)
TEXT runtime·panicIndexU<ABIInternal>(SB),NOSPLIT,$0-16
	JMP	runtime·goPanicIndexU<ABIInternal>(SB)

				return err
			}
			return nil
		}()
	})
	return compiler.version, compiler.err
}

// compilerSupportsLocation reports whether the compiler should be
// able to provide file/line information in backtraces.
func compilerSupportsLocation() bool {
	compiler, err := compilerVersion()
	if err != nil {
		return false
	}
	switch compiler.name {
	case "gcc":
		return compiler.major >= 10
	case "clang":

		return nil
	}

	if re.onepass != nil {
		return re.doOnePass(r, b, s, pos, ncap, dstCap)
	}
	if r == nil && len(b)+len(s) < re.maxBitStateLen {
		return re.backtrack(b, s, pos, ncap, dstCap)
	}

	m := re.get()
	i, _ := m.inputs.init(r, b, s)

	m.init(ncap)
	if !m.match(i, pos) {
		re.put(m)
		return nil
	}

	dstCap = append(dstCap, m.matchcap...)