Make int and double nullable by default

test/dart_codegen/expect/collection/iterable.dart

Index: test/dart_codegen/expect/collection/iterable.dart
diff --git a/test/dart_codegen/expect/collection/iterable.dart b/test/dart_codegen/expect/collection/iterable.dart
index 4649f59f0c58147303fc44bdcc0b3f6d50388f3d..1f097416575e533c8ebad74cf82213747c6f216a 100644
--- a/test/dart_codegen/expect/collection/iterable.dart
+++ b/test/dart_codegen/expect/collection/iterable.dart
@@ -120,7 +120,7 @@ part of dart.collection;
  E lastWhere(bool test(E value), {
   E orElse()}
 ) {
-  E result = ((__x0) => DDC$RT.cast(__x0, Null, E, "CastLiteral", """line 159, column 16 of dart:collection/iterable.dart: """, __x0 is E, false))(null);
+  E result = null;
    bool foundMatching = false;
    for (E element in this) {
     if (test(element)) {
@@ -133,7 +133,7 @@ part of dart.collection;
    throw IterableElementError.noElement();
   }
  E singleWhere(bool test(E value)) {
-  E result = ((__x1) => DDC$RT.cast(__x1, Null, E, "CastLiteral", """line 173, column 16 of dart:collection/iterable.dart: """, __x1 is E, false))(null);
+  E result = null;
    bool foundMatching = false;
    for (E element in this) {
     if (test(element)) {
@@ -281,7 +281,7 @@ for (E element in this) {
  E lastWhere(bool test(E value), {
 E orElse()}
 ) {
-E result = ((__x2) => DDC$RT.cast(__x2, Null, E, "CastLiteral", """line 355, column 16 of dart:collection/iterable.dart: """, __x2 is E, false))(null);
+E result = null;
  bool foundMatching = false;
  for (E element in this) {
   if (test(element)) {
@@ -294,7 +294,7 @@ E result = ((__x2) => DDC$RT.cast(__x2, Null, E, "CastLiteral", """line 355, col
  throw IterableElementError.noElement();
 }
  E singleWhere(bool test(E value)) {
-E result = ((__x3) => DDC$RT.cast(__x3, Null, E, "CastLiteral", """line 369, column 16 of dart:collection/iterable.dart: """, __x3 is E, false))(null);
+E result = null;
  bool foundMatching = false;
  for (E element in this) {
   if (test(element)) {
@@ -379,8 +379,8 @@ const int LENGTH_LIMIT = 80;
  var penultimate = null;
  var ultimate = null;
  if (!it.moveNext()) {
-  if (count <= HEAD_COUNT + TAIL_COUNT) return; ultimateString = ((__x4) => DDC$RT.cast(__x4, dynamic, String, "CastGeneral", """line 530, column 24 of dart:collection/iterable.dart: """, __x4 is String, true))(parts.removeLast());
-   penultimateString = ((__x5) => DDC$RT.cast(__x5, dynamic, String, "CastGeneral", """line 531, column 27 of dart:collection/iterable.dart: """, __x5 is String, true))(parts.removeLast());
+  if (count <= HEAD_COUNT + TAIL_COUNT) return; ultimateString = ((__x0) => DDC$RT.cast(__x0, dynamic, String, "CastGeneral", """line 530, column 24 of dart:collection/iterable.dart: """, __x0 is String, true))(parts.removeLast());
+   penultimateString = ((__x1) => DDC$RT.cast(__x1, dynamic, String, "CastGeneral", """line 531, column 27 of dart:collection/iterable.dart: """, __x1 is String, true))(parts.removeLast());
   }
  else {
   penultimate = it.current;
@@ -390,7 +390,7 @@ const int LENGTH_LIMIT = 80;
       parts.add("$penultimate");
        return;}
      ultimateString = "$penultimate";
-     penultimateString = ((__x6) => DDC$RT.cast(__x6, dynamic, String, "CastGeneral", """line 541, column 29 of dart:collection/iterable.dart: """, __x6 is String, true))(parts.removeLast());
+     penultimateString = ((__x2) => DDC$RT.cast(__x2, dynamic, String, "CastGeneral", """line 541, column 29 of dart:collection/iterable.dart: """, __x2 is String, true))(parts.removeLast());
      length += ultimateString.length + OVERHEAD;
     }
    else {
@@ -402,7 +402,7 @@ const int LENGTH_LIMIT = 80;
        count++;
        if (count > MAX_COUNT) {
         while (length > LENGTH_LIMIT - ELLIPSIS_SIZE - OVERHEAD && count > HEAD_COUNT) {
-          length -= ((__x7) => DDC$RT.cast(__x7, dynamic, int, "CastGeneral", """line 562, column 25 of dart:collection/iterable.dart: """, __x7 is int, true))(parts.removeLast().length + OVERHEAD);
+          length -= ((__x3) => DDC$RT.cast(__x3, dynamic, int, "CastGeneral", """line 562, column 25 of dart:collection/iterable.dart: """, __x3 is int, true))(parts.removeLast().length + OVERHEAD);
            count--;
           }
          parts.add("...");
@@ -419,7 +419,7 @@ const int LENGTH_LIMIT = 80;
    length += ELLIPSIS_SIZE + OVERHEAD;
   }
  while (length > LENGTH_LIMIT && parts.length > HEAD_COUNT) {
-  length -= ((__x8) => DDC$RT.cast(__x8, dynamic, int, "CastGeneral", """line 588, column 17 of dart:collection/iterable.dart: """, __x8 is int, true))(parts.removeLast().length + OVERHEAD);
+  length -= ((__x4) => DDC$RT.cast(__x4, dynamic, int, "CastGeneral", """line 588, column 17 of dart:collection/iterable.dart: """, __x4 is int, true))(parts.removeLast().length + OVERHEAD);
    if (elision == null) {
     elision = "...";
      length += ELLIPSIS_SIZE + OVERHEAD;