Check in codegen test expectations.

test/codegen/expect/language/regress_21793_test_none_multi.js

+dart_library.library('language/regress_21793_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__regress_21793_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const regress_21793_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  regress_21793_test_none_multi.A = dart.callableClass(function A(...args) {
+    const self = this;
+    function call(...args) {
+      return self.call.apply(self, args);
+    }
+    call.__proto__ = this.__proto__;
+    call.new.apply(call, args);
+    return call;
+  }, class A extends core.Object {
+    call(x) {
+      return x;
+    }
+  });
+  dart.setSignature(regress_21793_test_none_multi.A, {
+    methods: () => ({call: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  regress_21793_test_none_multi.main = function() {
+    core.print(dart.dcall(new regress_21793_test_none_multi.A(), 499));
+  };
+  dart.fn(regress_21793_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.regress_21793_test_none_multi = regress_21793_test_none_multi;
+});