Removed IllegalAccessException and UnsupportedOperationException.

runtime/lib/immutable_map.dart

 // Copyright (c) 2012, 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.
 // Immutable map class for compiler generated map literals.
 
 class ImmutableMap<K, V> implements Map<K, V> {
   final _ImmutableArray kvPairs_;
 
   const ImmutableMap._create(_ImmutableArray keyValuePairs)
       : kvPairs_ = keyValuePairs;
@@ skipping 54 matching lines @@
   bool containsValue(V value) {
     for (int i = 1; i < kvPairs_.length; i += 2) {
       if (value == kvPairs_[i]) {
         return true;
       }
     }
     return false;
   }
 
   void operator []=(K key, V value) {
-    throw const IllegalAccessException();
+    throw new StateError("Cannot set value in unmodifiable Map");

[floitsch, 2012/10/23 12:50:32]

why not const?

[Lasse Reichstein Nielsen, 2012/10/24 12:32:15]

Why const. It's an exception case that should happen at most once in a program.
Using "const" seems like premature optimization, and it grows the constant pool
unnecessarily.

   }
 
   V putIfAbsent(K key, V ifAbsent()) {
-    throw const IllegalAccessException();
+    throw new StateError("Cannot set value in unmodifiable Map");
   }
 
   void clear() {
-    throw const IllegalAccessException();
+    throw new StateError("Cannot clear unmodifiable Map");
   }
 
   V remove(K key) {
-    throw const IllegalAccessException();
+    throw new StateError("Cannot remove from unmodifiable Map");
   }
 
   String toString() {
     return Maps.mapToString(this);
   }
 }