Check in codegen test expectations.

test/codegen/expect/language/type_propagation2_test.js

Index: test/codegen/expect/language/type_propagation2_test.js
diff --git a/test/codegen/expect/language/type_propagation2_test.js b/test/codegen/expect/language/type_propagation2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..a5ee4fc42c01b9d343fce85daa94a6a3f8ede06b
--- /dev/null
+++ b/test/codegen/expect/language/type_propagation2_test.js
@@ -0,0 +1,37 @@
+dart_library.library('language/type_propagation2_test', null, /* Imports */[
+  'dart_sdk'
+], function load__type_propagation2_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const type_propagation2_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  type_propagation2_test.Bar = dart.callableClass(function Bar(...args) {
+    const self = this;
+    function call(...args) {
+      return self.call.apply(self, args);
+    }
+    call.__proto__ = this.__proto__;
+    call.new.apply(call, args);
+    return call;
+  }, class Bar extends core.Object {
+    noSuchMethod(e) {
+      return null;
+    }
+  });
+  type_propagation2_test.main = function() {
+    let d = new type_propagation2_test.Bar();
+    while (false) {
+      let input = dart.dcall(dart.fn(x => {
+      }, dynamicTodynamic()), null);
+      let p2 = dart.dsend(dart.dload(input, 'keys'), 'firstWhere', null);
+      let a2 = dart.dsend(dart.dload(input, 'keys'), 'firstWhere', null);
+      core.print(dart.equals(dart.dindex(input, a2), p2));
+    }
+  };
+  dart.fn(type_propagation2_test.main, VoidTodynamic());
+  // Exports:
+  exports.type_propagation2_test = type_propagation2_test;
+});