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

test/codegen/expect/DeltaBlue.js

Index: test/codegen/expect/DeltaBlue.js
diff --git a/test/codegen/expect/DeltaBlue.js b/test/codegen/expect/DeltaBlue.js
index 4e96c45442a5b2dc43bdef348545543f100ec9b5..744303f2bf38f69ed244fdfde21ec222a5e6996c 100644
--- a/test/codegen/expect/DeltaBlue.js
+++ b/test/codegen/expect/DeltaBlue.js
@@ -16,8 +16,8 @@ var DeltaBlue;
   }
   class Strength extends core.Object {
     Strength(value, name) {
-      this.value = value;
-      this.name = name;
+      dart.initField(Strength, this, 'value', value);
+      dart.initField(Strength, this, 'name', name);
     }
     nextWeaker() {
       return /* Unimplemented const */new core.List$(Strength).from([STRONG_PREFERRED, PREFERRED, STRONG_DEFAULT, NORMAL, WEAK_DEFAULT, WEAKEST])[core.$get](this.value);
@@ -44,7 +44,7 @@ var DeltaBlue;
   let WEAKEST = new Strength(6, "weakest");
   class Constraint extends core.Object {
     Constraint(strength) {
-      this.strength = strength;
+      dart.initField(Constraint, this, 'strength', strength);
     }
     addConstraint() {
       this.addToGraph();
@@ -80,8 +80,8 @@ var DeltaBlue;
   }
   class UnaryConstraint extends Constraint {
     UnaryConstraint(myOutput, strength) {
-      this.myOutput = myOutput;
-      this.satisfied = false;
+      dart.initField(UnaryConstraint, this, 'myOutput', myOutput);
+      dart.initField(UnaryConstraint, this, 'satisfied', false);
       super.Constraint(strength);
       this.addConstraint();
     }
@@ -137,9 +137,9 @@ var DeltaBlue;
   let BACKWARD = 0;
   class BinaryConstraint extends Constraint {
     BinaryConstraint(v1, v2, strength) {
-      this.v1 = v1;
-      this.v2 = v2;
-      this.direction = NONE;
+      dart.initField(BinaryConstraint, this, 'v1', v1);
+      dart.initField(BinaryConstraint, this, 'v2', v2);
+      dart.initField(BinaryConstraint, this, 'direction', NONE);
       super.Constraint(strength);
       this.addConstraint();
     }
@@ -197,8 +197,8 @@ var DeltaBlue;
   }
   class ScaleConstraint extends BinaryConstraint {
     ScaleConstraint(src, scale, offset, dest, strength) {
-      this.scale = scale;
-      this.offset = offset;
+      dart.initField(ScaleConstraint, this, 'scale', scale);
+      dart.initField(ScaleConstraint, this, 'offset', offset);
       super.BinaryConstraint(src, dest, strength);
     }
     addToGraph() {
@@ -242,13 +242,13 @@ var DeltaBlue;
   }
   class Variable extends core.Object {
     Variable(name, value) {
-      this.constraints = new core.List$(Constraint).from([]);
-      this.name = name;
-      this.value = value;
-      this.determinedBy = null;
-      this.mark = 0;
-      this.walkStrength = WEAKEST;
-      this.stay = true;
+      dart.initField(Variable, this, 'constraints', new core.List$(Constraint).from([]));
+      dart.initField(Variable, this, 'name', name);
+      dart.initField(Variable, this, 'value', value);
+      dart.initField(Variable, this, 'determinedBy', null);
+      dart.initField(Variable, this, 'mark', 0);
+      dart.initField(Variable, this, 'walkStrength', WEAKEST);
+      dart.initField(Variable, this, 'stay', true);
     }
     addConstraint(c) {
       this.constraints[core.$add](c);
@@ -261,7 +261,7 @@ var DeltaBlue;
   }
   class Planner extends core.Object {
     Planner() {
-      this.currentMark = 0;
+      dart.initField(Planner, this, 'currentMark', 0);
     }
     incrementalAdd(c) {
       let mark = this.newMark();
@@ -357,7 +357,7 @@ var DeltaBlue;
   }
   class Plan extends core.Object {
     Plan() {
-      this.list = new core.List$(Constraint).from([]);
+      dart.initField(Plan, this, 'list', new core.List$(Constraint).from([]));
     }
     addConstraint(c) {
       this.list[core.$add](c);