Check in codegen test expectations.

test/codegen/expect/language/range_analysis2_test.js

Index: test/codegen/expect/language/range_analysis2_test.js
diff --git a/test/codegen/expect/language/range_analysis2_test.js b/test/codegen/expect/language/range_analysis2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..ec0159e0b573379c97bf06483f27266c07da2c75
--- /dev/null
+++ b/test/codegen/expect/language/range_analysis2_test.js
@@ -0,0 +1,27 @@
+dart_library.library('language/range_analysis2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__range_analysis2_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const range_analysis2_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  range_analysis2_test.main = function() {
+    let a = 0;
+    let b = JSArrayOfint().of([1]);
+    function foo() {
+      return dart.notNull(b[dartx.get](a--)) + dart.notNull(b[dartx.get](a));
+    }
+    dart.fn(foo, VoidTodynamic());
+    expect$.Expect.throws(foo, dart.fn(e => core.RangeError.is(e), dynamicTobool()));
+  };
+  dart.fn(range_analysis2_test.main, VoidTodynamic());
+  // Exports:
+  exports.range_analysis2_test = range_analysis2_test;
+});