Check in codegen test expectations.

test/codegen/expect/language/inferrer_constructor_test.js

+dart_library.library('language/inferrer_constructor_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__inferrer_constructor_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const inferrer_constructor_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  inferrer_constructor_test.A = class A extends core.Object {
+    new(test) {
+      this.field = null;
+      if (dart.test(test)) {
+        return;
+        this.field = 42;
+      } else {
+        this.field = 54;
+      }
+    }
+  };
+  dart.setSignature(inferrer_constructor_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(inferrer_constructor_test.A, [dart.dynamic])})
+  });
+  inferrer_constructor_test.main = function() {
+    let a = new inferrer_constructor_test.A(true);
+    expect$.Expect.throws(dart.fn(() => dart.dsend(a.field, '+', 42), VoidTovoid()), dart.fn(e => core.NoSuchMethodError.is(e), dynamicTobool()));
+  };
+  dart.fn(inferrer_constructor_test.main, VoidTodynamic());
+  // Exports:
+  exports.inferrer_constructor_test = inferrer_constructor_test;
+});