Revert "Fix stepping in for-loops."

test/mjsunit/es6/debug-stepnext-for.js

-// Copyright 2014 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: --expose-debug-as debug --harmony
-
-Debug = debug.Debug;
-var break_count = 0
-var exception = null;
-var log = []
-
-var s = 0;
-var a = [1, 2, 3];
-var i = 0;
-
-function f() {
-  "use strict";
-  debugger;                      // Break a
-  var j;                         // Break b
-
-  for (var i in null) {          // Break c
-    s += a[i];
-  }
-
-  for (j in null) {              // Break d
-    s += a[j];
-  }
-
-  for (var i in a) {             // Break e
-    s += a[i];                   // Break E
-  }
-
-  for (j in a) {                 // Break f
-    s += a[j];                   // Break F
-  }
-
-  for (let i in a) {             // Break g
-    s += a[i];                   // Break G
-  }
-
-  for (var i of a) {             // Break h
-    s += i;                      // Break H
-  }
-
-  for (j of a) {                 // Break i
-    s += j;                      // Break I
-  }
-
-  for (let i of a) {             // Break j
-    s += i;                      // Break J
-  }
-
-  for (var i = 0; i < 3; i++) {  // Break k
-    s += a[i];                   // Break K
-  }
-
-  for (j = 0; j < 3; j++) {      // Break l
-    s += a[j];                   // Break L
-  }
-
-  // TODO(yangguo): add test case for for-let.
-}                                // Break y
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    var line = exec_state.frame(0).sourceLineText();
-    var col = exec_state.frame(0).sourceColumn();
-    print(line);
-    var match = line.match(/\/\/ Break (\w)$/);
-    assertEquals(2, match.length);
-    log.push(match[1] + col);
-    exec_state.prepareStep(Debug.StepAction.StepNext, 1);
-    break_count++;
-  } catch (e) {
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-f();
-Debug.setListener(null);         // Break z
-
-print(JSON.stringify(log));
-// The let declaration differs from var in that the loop variable
-// is declared in every iteration.
-var expected = [
-  // Entry
-  "a2","b2",
-  // Empty for-in-var: var decl, get enumerable
-  "c7","c16",
-  // Empty for-in: get enumerable
-  "d12",
-  // For-in-var: var decl, get enumerable, assign, body, assign, body, ...
-  "e7","e16","e11","E4","e11","E4","e11","E4",
-  // For-in: get enumerable, assign, body, assign, body, ...
-  "f12","f7","F4","f7","F4","f7","F4",
-  // For-in-let: get enumerable, assign new let, body, assign new let, ...
-  "g16","g7","G4","g7","G4","g7","G4",
-  // For-of-var: var decl, next(), body, next(), body, ...
-  "h7","h16","H4","h16","H4","h16","H4","h16",
-  // For-of: next(), body, next(), body, ...
-  "i12","I4","i12","I4","i12","I4","i12",
-  // For-of-let: next(), assign new let, body, next(), assign new let, ...
-  "j16","j7","J4","j16","j7","J4","j16","j7","J4","j16",
-  // For-var: var decl, condition, body, next, condition, body, ...
-  "k7","k20","K4","k23","k20","K4","k23","k20","K4","k23","k20",
-  // For: init, condition, body, next, condition, body, ...
-  "l11","l16","L4","l19","l16","L4","l19","l16","L4","l19","l16",
-  // Exit.
-  "y0","z0",
-]
-
-assertArrayEquals(expected, log);
-assertEquals(48, s);
-assertNull(exception);