Check in codegen test expectations.

test/codegen/expect/language/regress_11800_test.js

Index: test/codegen/expect/language/regress_11800_test.js
diff --git a/test/codegen/expect/language/regress_11800_test.js b/test/codegen/expect/language/regress_11800_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..a293808700fa9c755f9029b2222429d499429fb1
--- /dev/null
+++ b/test/codegen/expect/language/regress_11800_test.js
@@ -0,0 +1,27 @@
+dart_library.library('language/regress_11800_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__regress_11800_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 regress_11800_test = Object.create(null);
+  let ListAndintTodynamic = () => (ListAndintTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [core.List, core.int])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  regress_11800_test.test = function(a, v) {
+    a[dartx.set](v, v);
+  };
+  dart.fn(regress_11800_test.test, ListAndintTodynamic());
+  regress_11800_test.main = function() {
+    let list = core.List.new(2);
+    for (let i = 0; i < 20; i++)
+      regress_11800_test.test(list, 1);
+    expect$.Expect.equals(null, list[dartx.get](0));
+    expect$.Expect.equals(1, list[dartx.get](1));
+  };
+  dart.fn(regress_11800_test.main, VoidTodynamic());
+  // Exports:
+  exports.regress_11800_test = regress_11800_test;
+});