Check in codegen test expectations.

test/codegen/expect/language/issue4295001_test.js

Index: test/codegen/expect/language/issue4295001_test.js
diff --git a/test/codegen/expect/language/issue4295001_test.js b/test/codegen/expect/language/issue4295001_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..eb94c898a66c28e197a29dd821eb4eddcac8ca7b
--- /dev/null
+++ b/test/codegen/expect/language/issue4295001_test.js
@@ -0,0 +1,31 @@
+dart_library.library('language/issue4295001_test', null, /* Imports */[
+  'dart_sdk'
+], function load__issue4295001_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const issue4295001_test = Object.create(null);
+  let VoidToString = () => (VoidToString = dart.constFn(dart.definiteFunctionType(core.String, [])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue4295001_test.Issue4295001Test = class Issue4295001Test extends core.Object {
+    new(s) {
+      this.foo = s;
+      let f = dart.fn(() => s, VoidToString());
+    }
+    static testMain() {
+      let d = new issue4295001_test.Issue4295001Test("Hello");
+    }
+  };
+  dart.setSignature(issue4295001_test.Issue4295001Test, {
+    constructors: () => ({new: dart.definiteFunctionType(issue4295001_test.Issue4295001Test, [core.String])}),
+    statics: () => ({testMain: dart.definiteFunctionType(dart.void, [])}),
+    names: ['testMain']
+  });
+  issue4295001_test.main = function() {
+    issue4295001_test.Issue4295001Test.testMain();
+  };
+  dart.fn(issue4295001_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue4295001_test = issue4295001_test;
+});