Check in codegen test expectations.

test/codegen/expect/language/duplicate_constructor_test_none_multi.js

+dart_library.library('language/duplicate_constructor_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__duplicate_constructor_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const duplicate_constructor_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  duplicate_constructor_test_none_multi.Foo = class Foo extends core.Object {
+    new() {
+    }
+  };
+  dart.setSignature(duplicate_constructor_test_none_multi.Foo, {
+    constructors: () => ({new: dart.definiteFunctionType(duplicate_constructor_test_none_multi.Foo, [])})
+  });
+  duplicate_constructor_test_none_multi.main = function() {
+    new duplicate_constructor_test_none_multi.Foo();
+  };
+  dart.fn(duplicate_constructor_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.duplicate_constructor_test_none_multi = duplicate_constructor_test_none_multi;
+});