fixes #52, fields shadowing getters/setters or other fields

test/codegen/expect/constructors.js

Index: test/codegen/expect/constructors.js
diff --git a/test/codegen/expect/constructors.js b/test/codegen/expect/constructors.js
index 4fb06b7c78bdcf4b32eb76d6eb90753fddf2edc8..3982e1b75f481e8f33be36d9cd857c5b6a05f6b1 100644
--- a/test/codegen/expect/constructors.js
+++ b/test/codegen/expect/constructors.js
@@ -24,9 +24,16 @@ var constructors;
     }
   }
   dart.defineNamedConstructor(D, 'named');
+  let name$ = Symbol('name');
   class E extends core.Object {
+    get name() {
+      return this[name$];
+    }
+    set name(value) {
+      this[name$] = value;
+    }
     E(name) {
-      this.name = name;
+      this[name$] = name;
     }
   }
   class F extends E {
@@ -45,33 +52,68 @@ var constructors;
       let p1 = opts && 'p1' in opts ? opts.p1 : null;
     }
   }
+  let name$0 = Symbol('name');
   class I extends core.Object {
+    get name() {
+      return this[name$0];
+    }
+    set name(value) {
+      this[name$0] = value;
+    }
     I() {
-      this.name = 'default';
+      this[name$0] = 'default';
     }
     named(name) {
-      this.name = name;
+      this[name$0] = name;
     }
   }
   dart.defineNamedConstructor(I, 'named');
+  let nonInitialized = Symbol('nonInitialized');
+  let initialized = Symbol('initialized');
   class J extends core.Object {
+    get nonInitialized() {
+      return this[nonInitialized];
+    }
+    set nonInitialized(value) {
+      this[nonInitialized] = value;
+    }
+    get initialized() {
+      return this[initialized];
+    }
+    set initialized(value) {
+      this[initialized] = value;
+    }
     J() {
-      this.initialized = true;
-      this.nonInitialized = null;
+      this[initialized] = true;
+      this[nonInitialized] = null;
     }
   }
+  let s$ = Symbol('s');
   class K extends core.Object {
+    get s() {
+      return this[s$];
+    }
+    set s(value) {
+      this[s$] = value;
+    }
     K() {
-      this.s = 'a';
+      this[s$] = 'a';
     }
     withS(s) {
-      this.s = s;
+      this[s$] = s;
     }
   }
   dart.defineNamedConstructor(K, 'withS');
+  let foo$ = Symbol('foo');
   class L extends core.Object {
+    get foo() {
+      return this[foo$];
+    }
+    set foo(value) {
+      this[foo$] = value;
+    }
     L(foo) {
-      this.foo = foo;
+      this[foo$] = foo;
     }
   }
   class M extends L {