Check in codegen test expectations.

test/codegen/expect/language/issue10747_test.js

Index: test/codegen/expect/language/issue10747_test.js
diff --git a/test/codegen/expect/language/issue10747_test.js b/test/codegen/expect/language/issue10747_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..680c8a5f0abc70a809cb95256dbf636feba6632a
--- /dev/null
+++ b/test/codegen/expect/language/issue10747_test.js
@@ -0,0 +1,59 @@
+dart_library.library('language/issue10747_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__issue10747_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 issue10747_test = Object.create(null);
+  let B = () => (B = dart.constFn(issue10747_test.B$()))();
+  let A = () => (A = dart.constFn(issue10747_test.A$()))();
+  let AOfint = () => (AOfint = dart.constFn(issue10747_test.A$(core.int)))();
+  let AOfString = () => (AOfString = dart.constFn(issue10747_test.A$(core.String)))();
+  let BOfint = () => (BOfint = dart.constFn(issue10747_test.B$(core.int)))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue10747_test.B$ = dart.generic(T => {
+    class B extends core.Object {}
+    dart.addTypeTests(B);
+    return B;
+  });
+  issue10747_test.B = B();
+  issue10747_test.A$ = dart.generic(T => {
+    let BOfT = () => (BOfT = dart.constFn(issue10747_test.B$(T)))();
+    class A extends core.Object {
+      new(field) {
+        this.field = field;
+      }
+      asTypeVariable() {
+        return T.as(this.field);
+      }
+      asBOfT() {
+        return BOfT().as(this.field);
+      }
+    }
+    dart.addTypeTests(A);
+    dart.setSignature(A, {
+      constructors: () => ({new: dart.definiteFunctionType(issue10747_test.A$(T), [dart.dynamic])}),
+      methods: () => ({
+        asTypeVariable: dart.definiteFunctionType(dart.dynamic, []),
+        asBOfT: dart.definiteFunctionType(dart.dynamic, [])
+      })
+    });
+    return A;
+  });
+  issue10747_test.A = A();
+  issue10747_test.main = function() {
+    expect$.Expect.equals(42, new (AOfint())(42).asTypeVariable());
+    expect$.Expect.throws(dart.fn(() => new (AOfString())(42).asTypeVariable(), VoidTovoid()), dart.fn(e => core.CastError.is(e), dynamicTobool()));
+    let b = new (BOfint())();
+    expect$.Expect.equals(b, new (AOfint())(b).asBOfT());
+    expect$.Expect.throws(dart.fn(() => new (AOfString())(b).asBOfT(), VoidTovoid()), dart.fn(e => core.CastError.is(e), dynamicTobool()));
+  };
+  dart.fn(issue10747_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue10747_test = issue10747_test;
+});