text: // Copyright 2017 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.
  
  // Flags: --allow-natives-syntax --no-always-opt --no-stress-flush-bytecode
  // Files: test/mjsunit/code-coverage-utils.js
  
  %DebugToggleBlockCoverage(true);
  
  TestCoverage(
  "call an IIFE",
  `
  (function f() {})();
  `,
  [{"start":0,"end":20,"count":1},{"start":1,"end":16,"count":1}]
  );
  
  TestCoverage(
  "call locally allocated function",
  `let f = () => 1; f();`,
  [{"start":0,"end":21,"count":1},{"start":8,"end":15,"count":1}]
  );
  
  TestCoverage(
  "if statements",
  `
  function g() {}                           // 0000
  function f(x) {                           // 0050
    if (x == 42) {                          // 0100
      if (x == 43) g(); else g();           // 0150
    }                                       // 0200
    if (x == 42) { g(); } else { g(); }     // 0250
    if (x == 42) g(); else g();             // 0300
    if (false) g(); else g();               // 0350
    if (false) g();                         // 0400
    if (true) g(); else g();                // 0450
    if (true) g();                          // 0500
  }                                         // 0550
  f(42);                                    // 0600
  f(43);                                    // 0650
  if (true) {                               // 0700
    const foo = 'bar';                      // 0750
  } else {                                  // 0800
    const bar = 'foo';                      // 0850
  }                                         // 0900
  `,
  [{"start":0,"end":949,"count":1},
   {"start":801,"end":901,"count":0},
   {"start":0,"end":15,"count":11},
   {"start":50,"end":551,"count":2},
   {"start":115,"end":203,"count":1},
   {"start":167,"end":171,"count":0},
   {"start":265,"end":287,"count":1},
   {"start":315,"end":329,"count":1},
   {"start":363,"end":367,"count":0},
   {"start":413,"end":417,"count":0},
   {"start":466,"end":476,"count":0}]
  );
  
  TestCoverage(
  "if statement (early return)",
  `
  !function() {                             // 0000
    if (true) {                             // 0050
      nop();                                // 0100
      return;                               // 0150
      nop();                                // 0200
    }                                       // 0250
    nop();                                  // 0300
  }()                                       // 0350
  `,
  [{"start":0,"end":399,"count":1},
   {"start":1,"end":351,"count":1},
   {"start":161,"end":350,"count":0}]
  );
  
  TestCoverage(
  "if statement (no semi-colon)",
  `
  !function() {                             // 0000
    if (true) nop()                         // 0050
    if (true) nop(); else nop()             // 0100
    nop();                                  // 0150
  }()                                       // 0200
  `,
  [{"start":0,"end":249,"count":1},
   {"start":1,"end":201,"count":1},
   {"start":118,"end":129,"count":0}]
  );
  
  TestCoverage(
  "for statements",
  `
  function g() {}                           // 0000
  !function() {                             // 0050
    for (var i = 0; i < 12; i++) g();       // 0100
    for (var i = 0; i < 12; i++) {          // 0150
      g();                                  // 0200
    }                                       // 0250
    for (var i = 0; false; i++) g();        // 0300
    for (var i = 0; true; i++) break;       // 0350
    for (var i = 0; i < 12; i++) {          // 0400
      if (i % 3 == 0) g(); else g();        // 0450
    }                                       // 0500
  }();                                      // 0550
  `,
  [{"start":0,"end":599,"count":1},
   {"start":0,"end":15,"count":36},
   {"start":51,"end":551,"count":1},
   {"start":131,"end":135,"count":12},
   {"start":181,"end":253,"count":12},
   {"start":330,"end":334,"count":0},
   {"start":431,"end":503,"count":12},
   {"start":470,"end":474,"count":4},
   {"start":474,"end":484,"count":8}]
  );
  
  TestCoverage(
  "for statements pt. 2",
  `
  function g() {}                           // 0000
  !function() {                             // 0050
    let j = 0;                              // 0100
    for (let i = 0; i < 12; i++) g();       // 0150
    for (const i = 0; j < 12; j++) g();     // 0200
    for (j = 0; j < 12; j++) g();           // 0250
    for (;;) break;                         // 0300
  }();                                      // 0350
  `,
  [{"start":0,"end":399,"count":1},
   {"start":0,"end":15,"count":36},
   {"start":51,"end":351,"count":1},
   {"start":181,"end":185,"count":12},
   {"start":233,"end":237,"count":12},
   {"start":277,"end":281,"count":12}]
  );
  
  TestCoverage(
  "for statements (no semicolon)",
  `
  function g() {}                           // 0000
  !function() {                             // 0050
    for (let i = 0; i < 12; i++) g()        // 0100
    for (let i = 0; i < 12; i++) break      // 0150
    for (let i = 0; i < 12; i++) break; g() // 0200
  }();                                      // 0250
  `,
  [{"start":0,"end":299,"count":1},
   {"start":0,"end":15,"count":13},
   {"start":51,"end":251,"count":1},
   {"start":131,"end":134,"count":12}]
  );
  
  TestCoverage(
  "for statement (early return)",
  `
  !function() {                             // 0000
    for (var i = 0; i < 10; i++) {          // 0050
      nop();                                // 0100
      continue;                             // 0150
      nop();                                // 0200
    }                                       // 0250
    nop();                                  // 0300
    for (;;) {                              // 0350
      nop();                                // 0400
      break;                                // 0450
      nop();                                // 0500
    }                                       // 0550
    nop();                                  // 0600
    for (;;) {                              // 0650
      nop();                                // 0700
      return;                               // 0750
      nop();                                // 0800
    }                                       // 0850
    nop();                                  // 0900
  }()                                       // 0950
  `,
  [{"start":0,"end":999,"count":1},
   {"start":1,"end":951,"count":1},
   {"start":81,"end":253,"count":10},
   {"start":163,"end":253,"count":0},
   {"start":460,"end":553,"count":0},
   {"start":761,"end":950,"count":0}]
  );
  
  TestCoverage(
  "for-of and for-in statements",
  `
  !function() {                             // 0000
    var i;                                  // 0050
    for (i of [0,1,2,3]) { nop(); }         // 0100
    for (let j of [0,1,2,3]) { nop(); }     // 0150
    for (i in [0,1,2,3]) { nop(); }         // 0200
    for (let j in [0,1,2,3]) { nop(); }     // 0250
    var xs = [{a:0, b:1}, {a:1,b:0}];       // 0300
    for (var {a: x, b: y} of xs) { nop(); } // 0350
  }();                                      // 0400
  `,
  [{"start":0,"end":449,"count":1},
   {"start":1,"end":401,"count":1},
   {"start":123,"end":133,"count":4},
   {"start":177,"end":187,"count":4},
   {"start":223,"end":233,"count":4},
   {"start":277,"end":287,"count":4},
   {"start":381,"end":391,"count":2}]
  );
  
  TestCoverage(
  "for-await-of statements",
  `
  !async function() {                       // 0000
    for await (var x of [0,1,2,3]) {        // 0050
      nop();                                // 0100
    }                                       // 0150
  }();                                      // 0200
  %PerformMicrotaskCheckpoint();            // 0250
  `,
  [{"start":0,"end":299,"count":1},
   {"start":1,"end":201,"count":1},
   {"start":83,"end":153,"count":4}]
  );
  
  TestCoverage(
  "while and do-while statements",
  `
  function g() {}                           // 0000
  !function() {                             // 0050
    var i;                                  // 0100
    i = 0; while (i < 12) i++;              // 0150
    i = 0; while (i < 12) { g(); i++; }     // 0200
    i = 0; while (false) g();               // 0250
    i = 0; while (true) break;              // 0300
                                            // 0350
    i = 0; do i++; while (i < 12);          // 0400
    i = 0; do { g(); i++; }                 // 0450
           while (i < 12);                  // 0500
    i = 0; do { g(); } while (false);       // 0550
    i = 0; do { break; } while (true);      // 0600
  }();                                      // 0650
  `,
  [{"start":0,"end":699,"count":1},
   {"start":0,"end":15,"count":25},
   {"start":51,"end":651,"count":1},
   {"start":174,"end":178,"count":12},
   {"start":224,"end":237,"count":12},
   {"start":273,"end":277,"count":0},
   {"start":412,"end":416,"count":12},
   {"start":462,"end":475,"count":12}]
  );
  
  TestCoverage(
  "while statement (early return)",
  `
  !function() {                             // 0000
    let i = 0;                              // 0050
    while (i < 10) {                        // 0100
      i++;                                  // 0150
      continue;                             // 0200
      nop();                                // 0250
    }                                       // 0300
    nop();                                  // 0350
    while (true) {                          // 0400
      nop();                                // 0450
      break;                                // 0500
      nop();                                // 0550
    }                                       // 0600
    nop();                                  // 0650
    while (true) {                          // 0700
      nop();                                // 0750
      return;                               // 0800
      nop();                                // 0850
    }                                       // 0900
    nop();                                  // 0950
  }()                                       // 1000
  `,
  [{"start":0,"end":1049,"count":1},
   {"start":1,"end":1001,"count":1},
   {"start":117,"end":303,"count":10},
   {"start":213,"end":303,"count":0},
   {"start":510,"end":603,"count":0},
   {"start":811,"end":1000,"count":0}]
  );
  
  TestCoverage(
  "do-while statement (early return)",
  `
  !function() {                             // 0000
    let i = 0;                              // 0050
    do {                                    // 0100
      i++;                                  // 0150
      continue;                             // 0200
      nop();                                // 0250
    } while (i < 10);                       // 0300
    nop();                                  // 0350
    do {                                    // 0400
      nop();                                // 0450
      break;                                // 0500
      nop();                                // 0550
    } while (true);                         // 0600
    nop();                                  // 0650
    do {                                    // 0700
      nop();                                // 0750
      return;                               // 0800
      nop();                                // 0850
    } while (true);                         // 0900
    nop();                                  // 0950
  }()                                       // 1000
  `,
  [{"start":0,"end":1049,"count":1},
   {"start":1,"end":1001,"count":1},
   {"start":105,"end":303,"count":10},
   {"start":213,"end":303,"count":0},
   {"start":510,"end":603,"count":0},
   {"start":811,"end":1000,"count":0}]
  );
  
  TestCoverage(
  "return statements",
  `
  !function() { nop(); return; nop(); }();  // 0000
  !function() { nop(); return 42;           // 0050
                nop(); }();                 // 0100
  `,
  [{"start":0,"end":149,"count":1},
   {"start":1,"end":37,"count":1},
   {"start":28,"end":36,"count":0},
   {"start":51,"end":122,"count":1},
   {"start":81,"end":121,"count":0}]
  );
  
  TestCoverage(
  "try/catch/finally statements",
  `
  !function() {                             // 0000
    try { nop(); } catch (e) { nop(); }     // 0050
    try { nop(); } finally { nop(); }       // 0100
    try {                                   // 0150
      try { throw 42; } catch (e) { nop(); }// 0200
    } catch (e) { nop(); }                  // 0250
    try {                                   // 0300
      try { throw 42; } finally { nop(); }  // 0350
    } catch (e) { nop(); }                  // 0400
    try {                                   // 0450
      throw 42;                             // 0500
    } catch (e) {                           // 0550
      nop();                                // 0600
    } finally {                             // 0650
      nop();                                // 0700
    }                                       // 0750
  }();                                      // 0800
  `,
  [{"start":0,"end":849,"count":1},
   {"start":1,"end":801,"count":1},
   {"start":67,"end":87,"count":0},
   {"start":221,"end":222,"count":0},
   {"start":254,"end":274,"count":0},
   {"start":371,"end":372,"count":0},
   {"start":403,"end":404,"count":0},
   {"start":553,"end":554,"count":0}]
  );
  
  TestCoverage("try/catch/finally statements with early return",
  `
  !function() {                             // 0000
    try { throw 42; } catch (e) { return; } // 0050
    nop();                                  // 0100
  }();                                      // 0150
  !function() {                             // 0200
    try { throw 42; } catch (e) {}          // 0250
    finally { return; }                     // 0300
    nop();                                  // 0350
  }();                                      // 0400
  `,
  [{"start":0,"end":449,"count":1},
   {"start":1,"end":151,"count":1},
   {"start":69,"end":70,"count":0},
   {"start":91,"end":150,"count":0},
   {"start":201,"end":401,"count":1},
   {"start":269,"end":270,"count":0},
   {"start":321,"end":400,"count":0}]
  );
  
  TestCoverage(
  "early return in blocks",
  `
  !function() {                             // 0000
    try { throw 42; } catch (e) { return; } // 0050
    nop();                                  // 0100
  }();                                      // 0150
  !function() {                             // 0200
    try { nop(); } finally { return; }      // 0250
    nop();                                  // 0300
  }();                                      // 0350
  !function() {                             // 0400
    {                                       // 0450
      let x = 42;                           // 0500
      return () => x;                       // 0550
    }                                       // 0600
    nop();                                  // 0650
  }();                                      // 0700
  !function() {                             // 0750
    try { throw 42; } catch (e) {           // 0800
      return;                               // 0850
      nop();                                // 0900
    }                                       // 0950
    nop();                                  // 1000
  }();                                      // 1050
  `,
  [{"start":0,"end":1099,"count":1},
   {"start":1,"end":151,"count":1},
   {"start":69,"end":70,"count":0},
   {"start":91,"end":150,"count":0},
   {"start":201,"end":351,"count":1},
   {"start":286,"end":350,"count":0},
   {"start":401,"end":701,"count":1},
   {"start":603,"end":700,"count":0},
   {"start":561,"end":568,"count":0},
   {"start":751,"end":1051,"count":1},
   {"start":819,"end":820,"count":0},
   {"start":861,"end":1050,"count":0}]
  );
  
  TestCoverage(
  "switch statements",
  `
  !function() {                             // 0000
    var x = 42;                             // 0050
    switch (x) {                            // 0100
      case 41: nop(); break;                // 0150
      case 42: nop(); break;                // 0200
      default: nop(); break;                // 0250
    }                                       // 0300
  }();                                      // 0350
  `,
  [{"start":0,"end":399,"count":1},
   {"start":1,"end":351,"count":1},
   {"start":154,"end":204,"count":0},
   {"start":226,"end":350,"count":0}]
  );
  
  TestCoverage(
  "labeled break statements",
  `
  !function() {                             // 0000
    var x = 42;                             // 0050
    l0: switch (x) {                        // 0100
    case 41: return;                        // 0150
    case 42:                                // 0200
      switch (x) { case 42: break l0; }     // 0250
      break;                                // 0300
    }                                       // 0350
    l1: for (;;) {                          // 0400
      for (;;) break l1;                    // 0450
    }                                       // 0500
    l2: while (true) {                      // 0550
      while (true) break l2;                // 0600
    }                                       // 0650
    l3: do {                                // 0700
      do { break l3; } while (true);        // 0750
    } while (true);                         // 0800
    l4: { break l4; }                       // 0850
    l5: for (;;) for (;;) break l5;         // 0900
  }();                                      // 0950
  `,
  [{"start":0,"end":999,"count":1},
   {"start":1,"end":951,"count":1},
   {"start":152,"end":202,"count":0},
   {"start":285,"end":353,"count":0}]
  );
  
  TestCoverage(
  "labeled continue statements",
  `
  !function() {                             // 0000
    l0: for (var i0 = 0; i0 < 2; i0++) {    // 0050
      for (;;) continue l0;                 // 0100
    }                                       // 0150
    var i1 = 0;                             // 0200
    l1: while (i1 < 2) {                    // 0250
      i1++;                                 // 0300
      while (true) continue l1;             // 0350
    }                                       // 0400
    var i2 = 0;                             // 0450
    l2: do {                                // 0500
      i2++;                                 // 0550
      do { continue l2; } while (true);     // 0600
    } while (i2 < 2);                       // 0650
  }();                                      // 0700
  `,
  [{"start":0,"end":749,"count":1},
   {"start":1,"end":701,"count":1},
   {"start":87,"end":153,"count":2},
   {"start":271,"end":403,"count":2},
   {"start":509,"end":653,"count":2}]
  );
  
  TestCoverage(
  "conditional expressions",
  `
  var TRUE = true;                          // 0000
  var FALSE = false;                        // 0050
  !function() {                             // 0100
    TRUE ? nop() : nop();                   // 0150
    true ? nop() : nop();                   // 0200
    false ? nop() : nop();                  // 0250
    FALSE ? TRUE ? nop()                    // 0300
                 : nop()                    // 0350
          : nop();                          // 0400
    TRUE ? FALSE ? nop()                    // 0450
                 : nop()                    // 0500
         : nop();                           // 0550
    TRUE ? nop() : FALSE ? nop()            // 0600
                         : nop();           // 0650
    FALSE ? nop() : TRUE ? nop()            // 0700
                         : nop();           // 0750
  }();                                      // 0800
  `,
  [{"start":0,"end":849,"count":1},
   {"start":101,"end":801,"count":1},
   {"start":165,"end":172,"count":0},
   {"start":215,"end":222,"count":0},
   {"start":258,"end":265,"count":0},
   {"start":308,"end":372,"count":0},
   {"start":465,"end":472,"count":0},
   {"start":557,"end":564,"count":0},
   {"start":615,"end":680,"count":0},
   {"start":708,"end":715,"count":0},
   {"start":773,"end":780,"count":0}]
  );
  
  TestCoverage(
  "yield expressions",
  `
  const it = function*() {                  // 0000
    yield nop();                            // 0050
    yield nop() ? nop() : nop()             // 0100
    return nop();                           // 0150
  }();                                      // 0200
  it.next(); it.next();                     // 0250
  `,
  [{"start":0,"end":299,"count":1},
   {"start":11,"end":201,"count":1},
   {"start":114,"end":121,"count":0},
   {"start":129,"end":200,"count":0}]
  );
  
  TestCoverage(
  "yield expressions twice",
  `
  function* gen() {                         // 0000
    yield nop();                            // 0050
    yield nop() ? nop() : nop()             // 0100
    return nop();                           // 0150
  };                                        // 0200
  {const it = gen(); it.next(); it.next();} // 0250
  {const it = gen(); it.next(); it.next();} // 0300
  `,
  [{"start":0,"end":349,"count":1},
   {"start":0,"end":201,"count":2},
   {"start":114,"end":121,"count":0},
   {"start":129,"end":200,"count":0}]
  );
  
  TestCoverage(
  "yield expressions (.return and .throw)",
  `
  const it0 = function*() {                 // 0000
    yield 1; yield 2; yield 3;              // 0050
  }();                                      // 0100
  it0.next(); it0.return();                 // 0150
  try {                                     // 0200
    const it1 = function*() {               // 0250
      yield 1; yield 2; yield 3;            // 0300
    }();                                    // 0350
    it1.next(); it1.throw();                // 0400
  } catch (e) {}                            // 0450
  `,
  [{"start":0,"end":499,"count":1},
   {"start":451,"end":452,"count":0},
   {"start":12,"end":101,"count":1},
   {"start":60,"end":100,"count":0},
   {"start":264,"end":353,"count":1},
   {"start":312,"end":352,"count":0}]
  );
  
  TestCoverage("yield expressions (.return and try/catch/finally)",
  `
  const it = function*() {                  // 0000
    try {                                   // 0050
      yield 1; yield 2; yield 3;            // 0100
    } catch (e) {                           // 0150
      nop();                                // 0200
    } finally { nop(); }                    // 0250
    yield 4;                                // 0300
  }();                                      // 0350
  it.next(); it.return();                   // 0450
  `,
  [{"start":0,"end":449,"count":1},
   {"start":11,"end":351,"count":1},
   {"start":112,"end":254,"count":0},
   {"start":272,"end":350,"count":0}]
  );
  
  TestCoverage("yield expressions (.throw and try/catch/finally)",
  `
  const it = function*() {                  // 0000
    try {                                   // 0050
      yield 1; yield 2; yield 3;            // 0100
    } catch (e) {                           // 0150
      nop();                                // 0200
    } finally { nop(); }                    // 0250
    yield 4;                                // 0300
  }();                                      // 0350
  it.next(); it.throw(42);                  // 0550
  `,
  [{"start":0,"end":449,"count":1},
   {"start":11,"end":351,"count":1},
   {"start":112,"end":154,"count":0},
   {"start":310,"end":350,"count":0}]
  );
  
  TestCoverage(
  "yield* expressions",
  `
  const it = function*() {                  // 0000
    yield* gen();                           // 0050
    yield* nop() ? gen() : gen()            // 0100
    return gen();                           // 0150
  }();                                      // 0200
  it.next(); it.next(); it.next();          // 0250
  it.next(); it.next(); it.next();          // 0300
  `,
  [{"start":0,"end":349,"count":1},
   {"start":11,"end":201,"count":1},
   {"start":115,"end":122,"count":0},
   {"start":130,"end":200,"count":0}]
  );
  
  TestCoverage(
  "yield* expressions (.return and .throw)",
  `
  const it0 = function*() {                 // 0000
    yield* gen(); yield* gen(); yield 3;    // 0050
  }();                                      // 0100
  it0.next(); it0.return();                 // 0150
  try {                                     // 0200
    const it1 = function*() {               // 0250
      yield* gen(); yield* gen(); yield 3;  // 0300
    }();                                    // 0350
    it1.next(); it1.throw();                // 0400
  } catch (e) {}                            // 0450
  `,
  [{"start":0,"end":499,"count":1},
   {"start":451,"end":452,"count":0},
   {"start":12,"end":101,"count":1},
   {"start":65,"end":100,"count":0},
   {"start":264,"end":353,"count":1},
   {"start":317,"end":352,"count":0}]
  );
  
  TestCoverage(
  "await expressions",
  `
  async function f() {                      // 0000
    await 42;                               // 0050
    await 42;                               // 0100
  };                                        // 0150
  f();                                      // 0200
  %PerformMicrotaskCheckpoint();            // 0250
  `,
  [{"start":0,"end":299,"count":1},
   {"start":0,"end":151,"count":1}]
  );
  
  TestCoverage(
  "LogicalOrExpression assignment",
  `
  const a = true || 99                      // 0000
  function b () {                           // 0050
    const b = a || 2                        // 0100
  }                                         // 0150
  b()                                       // 0200
  b()                                       // 0250
  `,
  [{"start":0,"end":299,"count":1},
   {"start":15,"end":20,"count":0},
   {"start":50,"end":151,"count":2},
   {"start":114,"end":118,"count":0}]
  );
  
  TestCoverage(
  "LogicalOrExpression IsTest()",
  `
  true || false                             // 0000
  const a = 99                              // 0050
  a || 50                                   // 0100
  const b = false                           // 0150
  if (b || true) {}                         // 0200
  `,
  [{"start":0,"end":249,"count":1},
   {"start":5,"end":13,"count":0},
   {"start":102,"end":107,"count":0}]);
  
  TestCoverage(
  "LogicalAndExpression assignment",
  `
  const a = false && 99                     // 0000
  function b () {                           // 0050
    const b = a && 2                        // 0100
  }                                         // 0150
  b()                                       // 0200
  b()                                       // 0250
  const c = true && 50                      // 0300
  `,
  [{"start":0,"end":349,"count":1},
   {"start":16,"end":21,"count":0},
   {"start":50,"end":151,"count":2},
   {"start":114,"end":118,"count":0}]
  );
  
  TestCoverage(
  "LogicalAndExpression IsTest()",
  `
  false && true                             // 0000
  const a = 0                               // 0050
  a && 50                                   // 0100
  const b = true                            // 0150
  if (b && true) {}                         // 0200
  true && true                              // 0250
  `,
  [{"start":0,"end":299,"count":1},
   {"start":6,"end":13,"count":0},
   {"start":102,"end":107,"count":0}]);
  
  TestCoverage(
  "NaryLogicalOr assignment",
  `
  const a = true                            // 0000
  const b = false                           // 0050
  const c = false || false || 99            // 0100
  const d = false || true || 99             // 0150
  const e = true || true || 99              // 0200
  const f = b || b || 99                    // 0250
  const g = b || a || 99                    // 0300
  const h = a || a || 99                    // 0350
  const i = a || (b || c) || d              // 0400
  `,
  [{"start":0,"end":449,"count":1},
   {"start":174,"end":179,"count":0},
   {"start":215,"end":222,"count":0},
   {"start":223,"end":228,"count":0},
   {"start":317,"end":322,"count":0},
   {"start":362,"end":366,"count":0},
   {"start":367,"end":372,"count":0},
   {"start":412,"end":423,"count":0},
   {"start":424,"end":428,"count":0}]);
  
  TestCoverage(
  "NaryLogicalOr IsTest()",
  `
  const a = true                            // 0000
  const b = false                           // 0050
  false || false || 99                      // 0100
  false || true || 99                       // 0150
  true || true || 99                        // 0200
  b || b || 99                              // 0250
  b || a || 99                              // 0300
  a || a || 99                              // 0350
  `,
  [{"start":0,"end":399,"count":1},
   {"start":164,"end":169,"count":0},
   {"start":205,"end":212,"count":0},
   {"start":213,"end":218,"count":0},
   {"start":307,"end":312,"count":0},
   {"start":352,"end":356,"count":0},
   {"start":357,"end":362,"count":0}]);
  
  TestCoverage(
  "NaryLogicalAnd assignment",
  `
  const a = true                            // 0000
  const b = false                           // 0050
  const c = false && false && 99            // 0100
  const d = false && true && 99             // 0150
  const e = true && true && 99              // 0200
  const f = true && false || true           // 0250
  const g = true || false && true           // 0300
  `,
  [{"start":0,"end":349,"count":1},
   {"start":116,"end":124,"count":0},
   {"start":125,"end":130,"count":0},
   {"start":166,"end":173,"count":0},
   {"start":174,"end":179,"count":0},
   {"start":315,"end":331,"count":0}
  ]);
  
  TestCoverage(
  "NaryLogicalAnd IsTest()",
  `
  const a = true                            // 0000
  const b = false                           // 0050
  false && false && 99                      // 0100
  false && true && 99                       // 0150
  true && true && 99                        // 0200
  true && false || true                     // 0250
  true || false && true                     // 0300
  false || false || 99 || 55                // 0350
  `,
  [{"start":0,"end":399,"count":1},
   {"start":106,"end":114,"count":0},
   {"start":115,"end":120,"count":0},
   {"start":156,"end":163,"count":0},
   {"start":164,"end":169,"count":0},
   {"start":305,"end":321,"count":0},
   {"start":371,"end":376,"count":0}]);
  
  // see regression: https://bugs.chromium.org/p/chromium/issues/detail?id=785778
  TestCoverage(
  "logical expressions + conditional expressions",
  `
  const a = true                            // 0000
  const b = 99                              // 0050
  const c = false                           // 0100
  const d = ''                              // 0150
  const e = a && (b ? 'left' : 'right')     // 0200
  const f = a || (b ? 'left' : 'right')     // 0250
  const g = c || d ? 'left' : 'right'       // 0300
  const h = a && b && (b ? 'left' : 'right')// 0350
  const i = d || c || (c ? 'left' : 'right')// 0400
  `,
  [{"start":0,"end":449,"count":1},
   {"start":227,"end":236,"count":0},
   {"start":262,"end":287,"count":0},
   {"start":317,"end":325,"count":0},
   {"start":382,"end":391,"count":0},
   {"start":423,"end":431,"count":0}
  ]);
  
  TestCoverage(
  "https://crbug.com/827530",
  `
  Util = {};                                // 0000
  Util.escape = function UtilEscape(str) {  // 0050
    if (!str) {                             // 0100
      return 'if';                          // 0150
    } else {                                // 0200
      return 'else';                        // 0250
    }                                       // 0300
  };                                        // 0350
  Util.escape("foo.bar");                   // 0400
  `,
  [{"start":0,"end":449,"count":1},
   {"start":64,"end":351,"count":1},
   {"start":112,"end":203,"count":0}]
  );
  
  TestCoverage(
  "https://crbug.com/v8/8237",
  `
  !function() {                             // 0000
    if (true)                               // 0050
      while (false) return; else nop();     // 0100
  }();                                      // 0150
  !function() {                             // 0200
    if (true) l0: { break l0; } else        // 0250
      if (nop()) { }                        // 0300
  }();                                      // 0350
  !function() {                             // 0400
    if (true) { if (false) { return; }      // 0450
    } else if (nop()) { } }();              // 0500
  !function(){                              // 0550
    if(true)while(false)return;else nop()   // 0600
  }();                                      // 0650
  !function(){                              // 0700
    if(true) l0:{break l0}else if (nop()){} // 0750
  }();                                      // 0800
  !function(){                              // 0850
    if(true){if(false){return}}else         // 0900
      if(nop()){}                           // 0950
  }();                                      // 1000
  `,
  [{"start":0,"end":1049,"count":1},
   {"start":1,"end":151,"count":1},
   {"start":118,"end":137,"count":0},
   {"start":201,"end":351,"count":1},
   {"start":279,"end":318,"count":0},
   {"start":401,"end":525,"count":1},
   {"start":475,"end":486,"count":0},
   {"start":503,"end":523,"count":0},
   {"start":551,"end":651,"count":1},
   {"start":622,"end":639,"count":0},
   {"start":701,"end":801,"count":1},
   {"start":774,"end":791,"count":0},
   {"start":851,"end":1001,"count":1},
   {"start":920,"end":928,"count":0},
   {"start":929,"end":965,"count":0}]
  );
  
  TestCoverage(
  "terminal break statement",
  `
  while (true) {                            // 0000
    const b = false                         // 0050
    break                                   // 0100
  }                                         // 0150
  let stop = false                          // 0200
  while (true) {                            // 0250
    if (stop) {                             // 0300
      break                                 // 0350
    }                                       // 0400
    stop = true                             // 0450
  }                                         // 0500
  `,
  [{"start":0,"end":549,"count":1},
   {"start":263,"end":501,"count":2},
   {"start":312,"end":501,"count":1}]
  );
  
  TestCoverage(
  "terminal return statement",
  `
  function a () {                           // 0000
    const b = false                         // 0050
    return 1                                // 0100
  }                                         // 0150
  const b = (early) => {                    // 0200
    if (early) {                            // 0250
      return 2                              // 0300
    }                                       // 0350
    return 3                                // 0400
  }                                         // 0450
  const c = () => {                         // 0500
    if (true) {                             // 0550
      return                                // 0600
    }                                       // 0650
  }                                         // 0700
  a(); b(false); b(true); c()               // 0750
  `,
  [{"start":0,"end":799,"count":1},
   {"start":0,"end":151,"count":1},
   {"start":210,"end":451,"count":2},
   {"start":263,"end":450,"count":1},
   {"start":510,"end":701,"count":1}]
  );
  
  TestCoverage(
  "terminal blocks",
  `
  function a () {                           // 0000
    {                                       // 0050
      return 'a'                            // 0100
    }                                       // 0150
  }                                         // 0200
  function b () {                           // 0250
    {                                       // 0300
      {                                     // 0350
        return 'b'                          // 0400
      }                                     // 0450
    }                                       // 0500
  }                                         // 0550
  a(); b()                                  // 0600
  `,
  [{"start":0,"end":649,"count":1},
   {"start":0,"end":201,"count":1},
   {"start":250,"end":551,"count":1}]
  );
  
  TestCoverage(
  "terminal if statements",
  `
  function a (branch) {                     // 0000
    if (branch) {                           // 0050
      return 'a'                            // 0100
    } else {                                // 0150
      return 'b'                            // 0200
    }                                       // 0250
  }                                         // 0300
  function b (branch) {                     // 0350
    if (branch) {                           // 0400
      if (branch) {                         // 0450
        return 'c'                          // 0500
      }                                     // 0550
    }                                       // 0600
  }                                         // 0650
  function c (branch) {                     // 0700
    if (branch) {                           // 0750
      return 'c'                            // 0800
    } else {                                // 0850
      return 'd'                            // 0900
    }                                       // 0950
  }                                         // 1000
  function d (branch) {                     // 1050
    if (branch) {                           // 1100
      if (!branch) {                        // 1150
        return 'e'                          // 1200
      } else {                              // 1250
        return 'f'                          // 1300
      }                                     // 1350
    } else {                                // 1400
      // noop                               // 1450
    }                                       // 1500
  }                                         // 1550
  a(true); a(false); b(true); b(false)      // 1600
  c(true); d(true);                         // 1650
  `,
  [{"start":0,"end":1699,"count":1},
   {"start":0,"end":301,"count":2},
   {"start":64,"end":253,"count":1},
   {"start":350,"end":651,"count":2},
   {"start":414,"end":603,"count":1},
   {"start":700,"end":1001,"count":1},
   {"start":853,"end":953,"count":0},
   {"start":1050,"end":1551,"count":1},
   {"start":1167,"end":1255,"count":0},
   {"start":1403,"end":1503,"count":0}]
  );
  
  TestCoverage(
  "https://crbug.com/927464",
  `
  !function f() {                           // 0000
    function unused() { nop(); }            // 0050
    nop();                                  // 0100
  }();                                      // 0150
  `,
  [{"start":0,"end":199,"count":1},
   {"start":1,"end":151,"count":1},
   {"start":52,"end":80,"count":0}]
  );
  
  TestCoverage(
  "https://crbug.com/v8/8691",
  `
  function f(shouldThrow) {                 // 0000
    if (shouldThrow) {                      // 0050
      throw Error('threw')                  // 0100
    }                                       // 0150
  }                                         // 0200
  try {                                     // 0250
    f(true)                                 // 0300
  } catch (err) {                           // 0350
                                            // 0400
  }                                         // 0450
  try {                                     // 0500
    f(false)                                // 0550
  } catch (err) {}                          // 0600
  `,
  [{"start":0,"end":649,"count":1},
   {"start":351,"end":352,"count":0},
   {"start":602,"end":616,"count":0},
   {"start":0,"end":201,"count":2},
   {"start":69,"end":153,"count":1}]
  );
  
  %DebugToggleBlockCoverage(false);
  