More strong mode changes to analysis_server

pkg/analysis_server/lib/src/collections.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library collections;
 
 /**
- * Returns the concatentation of the input iterables.
+ * Returns the concatenation of the input [iterables].
  *
  * The returned iterable is a lazily-evaluated view on the input iterables.
  */
-Iterable concat(Iterable<Iterable> iterables) => iterables.expand((x) => x);
+Iterable/*<E>*/ concat/*<E>*/(Iterable<Iterable/*<E>*/ > iterables) =>
+    iterables.expand((x) => x);
 
 /**
- * Returns the concatentation of the input iterables as a [List].
+ * Returns the concatenation of the input [iterables] as a [List].
  */
-List concatToList(Iterable<Iterable> iterables) => concat(iterables).toList();
+List/*<E>*/ concatToList/*<E>*/(Iterable<Iterable/*<E>*/ > iterables) =>
+    concat(iterables).toList();
 
 /**
  * Returns the given [list] if it is not empty, or `null` otherwise.
  */
-List nullIfEmpty(List list) {
+List/*<E>*/ nullIfEmpty/*<E>*/(List/*<E>*/ list) {
   if (list == null) {
     return null;
   }
   if (list.isEmpty) {
     return null;
   }
   return list;
 }
 
 /// A pair of values.
 class Pair<E, F> {
   final E first;
   final F last;
 
   Pair(this.first, this.last);
 
   int get hashCode => first.hashCode ^ last.hashCode;
 
   bool operator ==(other) {
     if (other is! Pair) return false;
     return other.first == first && other.last == last;
   }
 
   String toString() => '($first, $last)';
 }