SDK core library fuzzy arrow fixes.

sdk/lib/async/future.dart

Index: sdk/lib/async/future.dart
diff --git a/sdk/lib/async/future.dart b/sdk/lib/async/future.dart
index eb5fa8b58ad808855a54955a98f6c41d5ee3f80b..42bfc5c7146fb338c3ad765b741ffdd6e82be8f2 100644
--- a/sdk/lib/async/future.dart
+++ b/sdk/lib/async/future.dart
@@ -382,7 +382,7 @@ abstract class Future<T> {
     try {
       // As each future completes, put its value into the corresponding
       // position in the list of values.
-      for (Future future in futures) {
+      for (var future in futures) {
         int pos = remaining;
         future.then((T value) {
           remaining--;