Check in codegen test expectations.

test/codegen/expect/language/issue_23914_test.js

Index: test/codegen/expect/language/issue_23914_test.js
diff --git a/test/codegen/expect/language/issue_23914_test.js b/test/codegen/expect/language/issue_23914_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f4f09f56e499cf319357b1b64c801a0f2a53f34c
--- /dev/null
+++ b/test/codegen/expect/language/issue_23914_test.js
@@ -0,0 +1,18 @@
+dart_library.library('language/issue_23914_test', null, /* Imports */[
+  'dart_sdk'
+], function load__issue_23914_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const collection = dart_sdk.collection;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const issue_23914_test = Object.create(null);
+  let LinkedListOfLinkedListEntry = () => (LinkedListOfLinkedListEntry = dart.constFn(collection.LinkedList$(collection.LinkedListEntry)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue_23914_test.main = function() {
+    let a = core.List.unmodifiable(new (LinkedListOfLinkedListEntry())());
+  };
+  dart.fn(issue_23914_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue_23914_test = issue_23914_test;
+});