No dynamic at runtime

test/codegen/expect/BenchmarkBase.js

 var BenchmarkBase = dart.defineLibrary(BenchmarkBase, {});
 var core = dart.import(core);
 (function(exports, core) {
   'use strict';
   class Expect extends core.Object {
     static equals(expected, actual) {
       if (!dart.equals(expected, actual)) {
         throw `Values not equal: ${expected} vs ${actual}`;
       }
     }
     static listEquals(expected, actual) {
       if (expected[core.$length] != actual[core.$length]) {
         throw `Lists have different lengths: ${expected[core.$length]} vs ${actual[core.$length]}`;
       }
       for (let i = 0; dart.notNull(i) < dart.notNull(actual[core.$length]); i = dart.notNull(i) + 1) {
         Expect.equals(expected[core.$get](i), actual[core.$get](i));
       }
     }
     fail(message) {
       throw message;
     }
   }
   dart.setSignature(Expect, {
-    methods: () => ({fail: [dart.dynamic, [dart.dynamic]]}),
+    methods: () => ({fail: [core.Object, [core.Object]]}),
     statics: () => ({
-      equals: [dart.void, [dart.dynamic, dart.dynamic]],
+      equals: [dart.void, [core.Object, core.Object]],
       listEquals: [dart.void, [core.List, core.List]]
     }),
     names: ['equals', 'listEquals']
   });
   class BenchmarkBase extends core.Object {
     BenchmarkBase(name) {
       this.name = name;
     }
     run() {}
     warmup() {
@@ skipping 45 matching lines @@
       measure: [core.double, []],
       report: [dart.void, []]
     }),
     statics: () => ({measureFor: [core.double, [core.Function, core.int]]}),
     names: ['measureFor']
   });
   // Exports:
   exports.Expect = Expect;
   exports.BenchmarkBase = BenchmarkBase;
 })(BenchmarkBase, core);