Check in codegen test expectations.

test/codegen/expect/language/value_range3_test.js

+dart_library.library('language/value_range3_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__value_range3_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 value_range3_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, [])))();
+  value_range3_test.A = class A extends core.Object {
+    copy(array, index1, index2) {
+      if (dart.test(dart.dsend(index1, '<', dart.dsend(index2, '+', index2)))) {
+        return dart.dindex(array, index1);
+      }
+    }
+  };
+  dart.setSignature(value_range3_test.A, {
+    methods: () => ({copy: dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic, dart.dynamic])})
+  });
+  value_range3_test.main = function() {
+    expect$.Expect.throws(dart.fn(() => new value_range3_test.A().copy(core.List.new(0), 0, 1), VoidTovoid()), dart.fn(e => core.RangeError.is(e), dynamicTobool()));
+  };
+  dart.fn(value_range3_test.main, VoidTodynamic());
+  // Exports:
+  exports.value_range3_test = value_range3_test;
+});