src/v8/test/debugger/regress/regress-5610.js

// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var Debug = debug.Debug;
var step_count = 0;

function listener(event, execState, eventData, data) {
  if (event != Debug.DebugEvent.Break) return;
  try {
    var line = execState.frame(0).sourceLineText();
    print(line);
    var [match, expected_count, step] = /\/\/ B(\d) (\w+)$/.exec(line);
    assertEquals(step_count++, parseInt(expected_count));
    if (step != "Continue") execState.prepareStep(Debug.StepAction[step]);
  } catch (e) {
    print(e, e.stack);
    quit(1);
  }
}

Debug.setListener(listener);

async function f() {
  var a = 1;
  debugger;          // B0 StepNext
  print(1);          // B1 StepNext
  return a;          // B2 StepNext
}                    // B3 Continue

f();