Make dart:core strong-mode clean.

sdk/lib/core/iterable.dart

Index: sdk/lib/core/iterable.dart
diff --git a/sdk/lib/core/iterable.dart b/sdk/lib/core/iterable.dart
index dd195023655e93658810725bd989c256ea3c339d..024cd7b84200bfe92d3886640f5ac773347c3d40 100644
--- a/sdk/lib/core/iterable.dart
+++ b/sdk/lib/core/iterable.dart
@@ -451,7 +451,7 @@ abstract class Iterable<E> {
    * equivalent to `(iterator..moveNext())..current`.
    */
   E get first {
-    Iterator it = iterator;
+    Iterator<E> it = iterator;
     if (!it.moveNext()) {
       throw IterableElementError.noElement();
     }
@@ -469,7 +469,7 @@ abstract class Iterable<E> {
    * without iterating through the previous ones).
    */
   E get last {
-    Iterator it = iterator;
+    Iterator<E> it = iterator;
     if (!it.moveNext()) {
       throw IterableElementError.noElement();
     }
@@ -486,7 +486,7 @@ abstract class Iterable<E> {
    * Throws a [StateError] if `this` is empty or has more than one element.
    */
   E get single {
-    Iterator it = iterator;
+    Iterator<E> it = iterator;
     if (!it.moveNext()) throw IterableElementError.noElement();
     E result = it.current;
     if (it.moveNext()) throw IterableElementError.tooMany();
@@ -612,7 +612,7 @@ class _GeneratorIterable<E> extends Iterable<E>
   final _Generator<E> _generator;
   _GeneratorIterable(this._end, E generator(int n))
       : _start = 0,
-        _generator = (generator != null) ? generator : _id;
+        _generator = (generator != null) ? generator : _id as _Generator<E>;

[Lasse Reichstein Nielsen, 2016/04/16 09:58:22]

That might need some documentation since the cast is known to fail if E isn't
int (or compatible). It's basically a check, not a cast.

[floitsch, 2016/04/19 15:36:39]

Done.

 
   _GeneratorIterable.slice(this._start, this._end, this._generator);