Make int and double nullable by default

test/dart_codegen/expect/collection/list.dart

 part of dart.collection;
  abstract class ListBase<E> extends Object with ListMixin<E> {static String listToString(List list) => IterableBase.iterableToFullString(list, '[', ']');
 }
  abstract class ListMixin<E> implements List<E> {Iterator<E> get iterator => new ListIterator<E>(this);
  E elementAt(int index) => this[index];
  void forEach(void action(E element)) {
 int length = this.length;
  for (int i = 0; i < length; i++) {
   action(this[i]);
    if (length != this.length) {
@@ skipping 69 matching lines @@
    if (test(element)) return element;
    if (length != this.length) {
     throw new ConcurrentModificationError(this);
     }
   }
  if (orElse != null) return orElse();
  throw IterableElementError.noElement();
 }
  E singleWhere(bool test(E element)) {
 int length = this.length;
- E match = ((__x9) => DDC$RT.cast(__x9, Null, E, "CastLiteral", """line 151, column 15 of dart:collection/list.dart: """, __x9 is E, false))(null);
+ E match = null;
  bool matchFound = false;
  for (int i = 0; i < length; i++) {
   E element = this[i];
    if (test(element)) {
     if (matchFound) {
       throw IterableElementError.tooMany();
       }
      matchFound = true;
      match = element;
     }
    if (length != this.length) {
     throw new ConcurrentModificationError(this);
     }
   }
  if (matchFound) return match;
  throw IterableElementError.noElement();
 }
  String join([String separator = ""]) {
 if (length == 0) return "";
  StringBuffer buffer = new StringBuffer()..writeAll(this, separator);
  return buffer.toString();
 }
  Iterable<E> where(bool test(E element)) => new WhereIterable<E>(this, test);
- Iterable map(f(E element)) => new MappedListIterable(this, DDC$RT.wrap((dynamic f(E __u10)) {
+ Iterable map(f(E element)) => new MappedListIterable(this, DDC$RT.wrap((dynamic f(E __u5)) {
 dynamic c(E x0) => f(DDC$RT.cast(x0, dynamic, E, "CastParam", """line 178, column 62 of dart:collection/list.dart: """, x0 is E, false));
  return f == null ? null : c;
 }
-, f, DDC$RT.type((__t13<E> _) {
+, f, DDC$RT.type((__t8<E> _) {
 }
-), __t11, "Wrap", """line 178, column 62 of dart:collection/list.dart: """, f is __t11));
+), __t6, "Wrap", """line 178, column 62 of dart:collection/list.dart: """, f is __t6));
  Iterable expand(Iterable f(E element)) => new ExpandIterable<E, dynamic>(this, f);
  E reduce(E combine(E previousValue, E element)) {
 int length = this.length;
  if (length == 0) throw IterableElementError.noElement();
  E value = this[0];
  for (int i = 1; i < length; i++) {
   value = combine(value, this[i]);
    if (length != this.length) {
     throw new ConcurrentModificationError(this);
     }
   }
  return value;
 }
  fold(var initialValue, combine(var previousValue, E element)) {
 var value = initialValue;
  int length = this.length;
  for (int i = 0; i < length; i++) {
   value = combine(value, this[i]);
    if (length != this.length) {
     throw new ConcurrentModificationError(this);
     }
   }
  return value;
 }
- Iterable<E> skip(int count) => new SubListIterable<E>(this, count, ((__x15) => DDC$RT.cast(__x15, Null, int, "CastLiteral", """line 208, column 70 of dart:collection/list.dart: """, __x15 is int, true))(null));
+ Iterable<E> skip(int count) => new SubListIterable<E>(this, count, null);
  Iterable<E> skipWhile(bool test(E element)) {
 return new SkipWhileIterable<E>(this, test);
 }
  Iterable<E> take(int count) => new SubListIterable<E>(this, 0, count);
  Iterable<E> takeWhile(bool test(E element)) {
 return new TakeWhileIterable<E>(this, test);
 }
  List<E> toList({
 bool growable : true}
 ) {
@@ skipping 28 matching lines @@
 for (int i = 0; i < this.length; i++) {
   if (this[i] == element) {
     this.setRange(i, this.length - 1, this, i + 1);
      this.length -= 1;
      return true;
     }
   }
  return false;
 }
  void removeWhere(bool test(E element)) {
-_filter(this, DDC$RT.wrap((bool f(E __u16)) {
+_filter(this, DDC$RT.wrap((bool f(E __u10)) {
   bool c(E x0) => f(DDC$RT.cast(x0, dynamic, E, "CastParam", """line 264, column 19 of dart:collection/list.dart: """, x0 is E, false));
    return f == null ? null : c;
   }
-, test, DDC$RT.type((__t19<E> _) {
+, test, DDC$RT.type((__t13<E> _) {
   }
-), __t17, "Wrap", """line 264, column 19 of dart:collection/list.dart: """, test is __t17), false);
+), __t11, "Wrap", """line 264, column 19 of dart:collection/list.dart: """, test is __t11), false);
 }
  void retainWhere(bool test(E element)) {
-_filter(this, DDC$RT.wrap((bool f(E __u21)) {
+_filter(this, DDC$RT.wrap((bool f(E __u15)) {
   bool c(E x0) => f(DDC$RT.cast(x0, dynamic, E, "CastParam", """line 268, column 19 of dart:collection/list.dart: """, x0 is E, false));
    return f == null ? null : c;
   }
-, test, DDC$RT.type((__t19<E> _) {
+, test, DDC$RT.type((__t13<E> _) {
   }
-), __t17, "Wrap", """line 268, column 19 of dart:collection/list.dart: """, test is __t17), true);
+), __t11, "Wrap", """line 268, column 19 of dart:collection/list.dart: """, test is __t11), true);
 }
  static void _filter(List source, bool test(var element), bool retainMatching) {
 List retained = [];
  int length = source.length;
  for (int i = 0; i < length; i++) {
   var element = source[i];
    if (test(element) == retainMatching) {
     retained.add(element);
     }
    if (length != source.length) {
@@ skipping 14 matching lines @@
   }
  E result = this[length - 1];
  length--;
  return result;
 }
  void sort([int compare(E a, E b)]) {
 if (compare == null) {
   var defaultCompare = Comparable.compare;
    compare = defaultCompare;
   }
- Sort.sort(this, DDC$RT.wrap((int f(E __u22, E __u23)) {
+ Sort.sort(this, DDC$RT.wrap((int f(E __u16, E __u17)) {
   int c(E x0, E x1) => f(DDC$RT.cast(x0, dynamic, E, "CastParam", """line 309, column 21 of dart:collection/list.dart: """, x0 is E, false), DDC$RT.cast(x1, dynamic, E, "CastParam", """line 309, column 21 of dart:collection/list.dart: """, x1 is E, false));
    return f == null ? null : c;
   }
-, compare, DDC$RT.type((__t27<E> _) {
+, compare, DDC$RT.type((__t21<E> _) {
   }
-), __t24, "Wrap", """line 309, column 21 of dart:collection/list.dart: """, compare is __t24));
+), __t18, "Wrap", """line 309, column 21 of dart:collection/list.dart: """, compare is __t18));
 }
  void shuffle([Random random]) {
 if (random == null) random = new Random();
  int length = this.length;
  while (length > 1) {
   int pos = random.nextInt(length);
    length -= 1;
    var tmp = this[length];
    this[length] = this[pos];
    this[pos] = tmp;
@@ skipping 45 matching lines @@
   }
  else {
   otherList = iterable.skip(skipCount).toList(growable: false);
    otherStart = 0;
   }
  if (otherStart + length > otherList.length) {
   throw IterableElementError.tooFew();
   }
  if (otherStart < start) {
   for (int i = length - 1; i >= 0; i--) {
-    this[start + i] = ((__x30) => DDC$RT.cast(__x30, dynamic, E, "CastGeneral", """line 381, column 27 of dart:collection/list.dart: """, __x30 is E, false))(otherList[otherStart + i]);
+    this[start + i] = ((__x24) => DDC$RT.cast(__x24, dynamic, E, "CastGeneral", """line 381, column 27 of dart:collection/list.dart: """, __x24 is E, false))(otherList[otherStart + i]);
     }
   }
  else {
   for (int i = 0; i < length; i++) {
-    this[start + i] = ((__x31) => DDC$RT.cast(__x31, dynamic, E, "CastGeneral", """line 385, column 27 of dart:collection/list.dart: """, __x31 is E, false))(otherList[otherStart + i]);
+    this[start + i] = ((__x25) => DDC$RT.cast(__x25, dynamic, E, "CastGeneral", """line 385, column 27 of dart:collection/list.dart: """, __x25 is E, false))(otherList[otherStart + i]);
     }
   }
 }
  void replaceRange(int start, int end, Iterable<E> newContents) {
 RangeError.checkValidRange(start, end, this.length);
  if (newContents is! EfficientLength) {
   newContents = newContents.toList();
   }
  int removeLength = end - start;
  int insertLength = newContents.length;
@@ skipping 81 matching lines @@
   }
  else {
   for (E element in iterable) {
     this[index++] = element;
     }
   }
 }
  Iterable<E> get reversed => new ReversedListIterable<E>(this);
  String toString() => IterableBase.iterableToFullString(this, '[', ']');
 }
- typedef dynamic __t11(dynamic __u12);
- typedef dynamic __t13<E>(E __u14);
- typedef bool __t17(dynamic __u18);
- typedef bool __t19<E>(E __u20);
- typedef int __t24(dynamic __u25, dynamic __u26);
- typedef int __t27<E>(E __u28, E __u29);
+ typedef dynamic __t6(dynamic __u7);
+ typedef dynamic __t8<E>(E __u9);
+ typedef bool __t11(dynamic __u12);
+ typedef bool __t13<E>(E __u14);
+ typedef int __t18(dynamic __u19, dynamic __u20);
+ typedef int __t21<E>(E __u22, E __u23);