fixes #147, add more cases to isStateless

lib/runtime/dart/collection.js

 var collection;
 (function(exports) {
   'use strict';
   let _source = Symbol('_source');
   let UnmodifiableListView$ = dart.generic(function(E) {
     class UnmodifiableListView extends _internal.UnmodifiableListBase$(E) {
       UnmodifiableListView(source) {
         this[_source] = source;
       }
       get [core.$length]() {
@@ skipping 1590 matching lines @@
       [core.$toSet]() {
         let result = new (core.Set$(E))();
         for (let i = 0; dart.notNull(i) < dart.notNull(this[core.$length]); i = dart.notNull(i) + 1) {
           result.add(this[core.$get](i));
         }
         return result;
       }
       [core.$add](element) {
         dart.as(element, E);
         this[core.$set]((() => {
-          let o = this, x = o[core.$length];
-          o[core.$length] = dart.notNull(x) + 1;
+          let x = this[core.$length];
+          this[core.$length] = dart.notNull(x) + 1;
           return x;
         }).bind(this)(), element);
       }
       [core.$addAll](iterable) {
         dart.as(iterable, core.Iterable$(E));
         for (let element of iterable) {
           this[core.$set]((() => {
-            let o = this, x = o[core.$length];
-            o[core.$length] = dart.notNull(x) + 1;
+            let x = this[core.$length];
+            this[core.$length] = dart.notNull(x) + 1;
             return x;
           }).bind(this)(), element);
         }
       }
       [core.$remove](element) {
         for (let i = 0; dart.notNull(i) < dart.notNull(this[core.$length]); i = dart.notNull(i) + 1) {
           if (dart.equals(this[core.$get](i), element)) {
             this[core.$setRange](i, dart.notNull(this[core.$length]) - 1, this, dart.notNull(i) + 1);
-            let o = this;
-            o[core.$length] = dart.notNull(o[core.$length]) - 1;
+            this[core.$length] = dart.notNull(this[core.$length]) - 1;
             return true;
           }
         }
         return false;
       }
       [core.$removeWhere](test) {
         dart.as(test, dart.functionType(core.bool, [E]));
         ListMixin._filter(this, test, false);
       }
       [core.$retainWhere](test) {
@@ skipping 72 matching lines @@
         return result;
       }
       [core.$getRange](start, end) {
         core.RangeError.checkValidRange(start, end, this[core.$length]);
         return new (_internal.SubListIterable$(E))(this, start, end);
       }
       [core.$removeRange](start, end) {
         core.RangeError.checkValidRange(start, end, this[core.$length]);
         let length = dart.notNull(end) - dart.notNull(start);
         this[core.$setRange](start, dart.notNull(this[core.$length]) - dart.notNull(length), this, end);
-        let o = this;
-        o[core.$length] = dart.notNull(o[core.$length]) - dart.notNull(length);
+        this[core.$length] = dart.notNull(this[core.$length]) - dart.notNull(length);
       }
       [core.$fillRange](start, end, fill) {
         if (fill === void 0)
           fill = null;
         dart.as(fill, E);
         core.RangeError.checkValidRange(start, end, this[core.$length]);
         for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
           this[core.$set](i, fill);
         }
       }
@@ skipping 92 matching lines @@
       }
       [core.$insert](index, element) {
         dart.as(element, E);
         core.RangeError.checkValueInInterval(index, 0, this[core.$length], "index");
         if (index == this[core.$length]) {
           this[core.$add](element);
           return;
         }
         if (!(typeof index == 'number'))
           throw new core.ArgumentError(index);
-        let o = this;
-        o[core.$length] = dart.notNull(o[core.$length]) + 1;
+        this[core.$length] = dart.notNull(this[core.$length]) + 1;
         this[core.$setRange](dart.notNull(index) + 1, this[core.$length], this, index);
         this[core.$set](index, element);
       }
       [core.$removeAt](index) {
         let result = this[core.$get](index);
         this[core.$setRange](index, dart.notNull(this[core.$length]) - 1, this, dart.notNull(index) + 1);
         this[core.$length] = dart.notNull(this[core.$length]) - 1;
         return result;
       }
       [core.$insertAll](index, iterable) {
         dart.as(iterable, core.Iterable$(E));
         core.RangeError.checkValueInInterval(index, 0, this[core.$length], "index");
         if (dart.is(iterable, _internal.EfficientLength)) {
           iterable = iterable[core.$toList]();
         }
         let insertionLength = iterable[core.$length];
-        let o = this;
-        o[core.$length] = dart.notNull(o[core.$length]) + dart.notNull(insertionLength);
+        this[core.$length] = dart.notNull(this[core.$length]) + dart.notNull(insertionLength);
         this[core.$setRange](dart.notNull(index) + dart.notNull(insertionLength), this[core.$length], this, index);
         this[core.$setAll](index, iterable);
       }
       [core.$setAll](index, iterable) {
         dart.as(iterable, core.Iterable$(E));
         if (dart.is(iterable, core.List)) {
           this[core.$setRange](index, dart.notNull(index) + dart.notNull(iterable[core.$length]), iterable);
         } else {
           for (let element of iterable) {
             this[core.$set]((() => {
@@ skipping 3311 matching lines @@
   exports.LinkedHashMapKeyIterable$ = LinkedHashMapKeyIterable$;
   exports.LinkedHashMapKeyIterable = LinkedHashMapKeyIterable;
   exports.LinkedHashMapKeyIterator$ = LinkedHashMapKeyIterator$;
   exports.LinkedHashMapKeyIterator = LinkedHashMapKeyIterator;
   exports.HashSetIterator$ = HashSetIterator$;
   exports.HashSetIterator = HashSetIterator;
   exports.LinkedHashSetCell = LinkedHashSetCell;
   exports.LinkedHashSetIterator$ = LinkedHashSetIterator$;
   exports.LinkedHashSetIterator = LinkedHashSetIterator;
 })(collection || (collection = {}));