canonicalize const

test/codegen/expect/DeltaBlue.js

 var DeltaBlue;
 (function(exports) {
   'use strict';
   // Function main: () → dynamic
   function main() {
     new DeltaBlue().report();
   }
   class DeltaBlue extends BenchmarkBase.BenchmarkBase {
     DeltaBlue() {
       super.BenchmarkBase("DeltaBlue");
     }
     run() {
       chainTest(100);
       projectionTest(100);
     }
   }
   class Strength extends core.Object {
     Strength(value, name) {
       this.value = value;
       this.name = name;
     }
     nextWeaker() {
-      return /* Unimplemented const */dart.setType([STRONG_PREFERRED, PREFERRED, STRONG_DEFAULT, NORMAL, WEAK_DEFAULT, WEAKEST], core.List$(Strength))[core.$get](this.value);
+      return dart.const(dart.setType([STRONG_PREFERRED, PREFERRED, STRONG_DEFAULT, NORMAL, WEAK_DEFAULT, WEAKEST], core.List$(Strength)))[core.$get](this.value);
     }
     static stronger(s1, s2) {
       return dart.notNull(s1.value) < dart.notNull(s2.value);
     }
     static weaker(s1, s2) {
       return dart.notNull(s1.value) > dart.notNull(s2.value);
     }
     static weakest(s1, s2) {
       return Strength.weaker(s1, s2) ? s1 : s2;
     }
     static strongest(s1, s2) {
       return Strength.stronger(s1, s2) ? s1 : s2;
     }
   }
-  let REQUIRED = new Strength(0, "required");
-  let STRONG_PREFERRED = new Strength(1, "strongPreferred");
-  let PREFERRED = new Strength(2, "preferred");
-  let STRONG_DEFAULT = new Strength(3, "strongDefault");
-  let NORMAL = new Strength(4, "normal");
-  let WEAK_DEFAULT = new Strength(5, "weakDefault");
-  let WEAKEST = new Strength(6, "weakest");
+  let REQUIRED = dart.const(new Strength(0, "required"));
+  let STRONG_PREFERRED = dart.const(new Strength(1, "strongPreferred"));
+  let PREFERRED = dart.const(new Strength(2, "preferred"));
+  let STRONG_DEFAULT = dart.const(new Strength(3, "strongDefault"));
+  let NORMAL = dart.const(new Strength(4, "normal"));
+  let WEAK_DEFAULT = dart.const(new Strength(5, "weakDefault"));
+  let WEAKEST = dart.const(new Strength(6, "weakest"));
   class Constraint extends core.Object {
     Constraint(strength) {
       this.strength = strength;
     }
     addConstraint() {
       this.addToGraph();
       exports.planner.incrementalAdd(this);
     }
     satisfy(mark) {
       this.chooseMethod(dart.as(mark, core.int));
@@ skipping 405 matching lines @@
   exports.BinaryConstraint = BinaryConstraint;
   exports.ScaleConstraint = ScaleConstraint;
   exports.EqualityConstraint = EqualityConstraint;
   exports.Variable = Variable;
   exports.Planner = Planner;
   exports.Plan = Plan;
   exports.chainTest = chainTest;
   exports.projectionTest = projectionTest;
   exports.change = change;
 })(DeltaBlue || (DeltaBlue = {}));