Check in codegen test expectations.

test/codegen/expect/language/generics2_test.js

+dart_library.library('language/generics2_test', null, /* Imports */[
+  'dart_sdk'
+], function load__generics2_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const generics2_test = Object.create(null);
+  let A = () => (A = dart.constFn(generics2_test.A$()))();
+  let Pair = () => (Pair = dart.constFn(generics2_test.Pair$()))();
+  let PairOfint$int = () => (PairOfint$int = dart.constFn(generics2_test.Pair$(core.int, core.int)))();
+  let PairOfString$int = () => (PairOfString$int = dart.constFn(generics2_test.Pair$(core.String, core.int)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  generics2_test.A$ = dart.generic(E => {
+    class A extends core.Object {}
+    dart.addTypeTests(A);
+    return A;
+  });
+  generics2_test.A = A();
+  generics2_test.Pair$ = dart.generic((P, Q) => {
+    class Pair extends generics2_test.A {
+      new(fst, snd) {
+        this.fst = fst;
+        this.snd = snd;
+      }
+    }
+    dart.setSignature(Pair, {
+      constructors: () => ({new: dart.definiteFunctionType(generics2_test.Pair$(P, Q), [P, Q])})
+    });
+    return Pair;
+  });
+  generics2_test.Pair = Pair();
+  generics2_test.main = function() {
+    core.print(new (PairOfint$int())(1, 2));
+    core.print(new (PairOfString$int())("1", 2));
+  };
+  dart.fn(generics2_test.main, VoidTodynamic());
+  // Exports:
+  exports.generics2_test = generics2_test;
+});