Check in codegen test expectations.

test/codegen/expect/language/compile_time_constant_arguments_test_none_multi.js

+dart_library.library('language/compile_time_constant_arguments_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__compile_time_constant_arguments_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const compile_time_constant_arguments_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  compile_time_constant_arguments_test_none_multi.A = class A extends core.Object {
+    new(a) {
+    }
+    named(opts) {
+      let a = opts && 'a' in opts ? opts.a : 42;
+    }
+    optional(a) {
+      if (a === void 0) a = null;
+    }
+  };
+  dart.defineNamedConstructor(compile_time_constant_arguments_test_none_multi.A, 'named');
+  dart.defineNamedConstructor(compile_time_constant_arguments_test_none_multi.A, 'optional');
+  dart.setSignature(compile_time_constant_arguments_test_none_multi.A, {
+    constructors: () => ({
+      new: dart.definiteFunctionType(compile_time_constant_arguments_test_none_multi.A, [dart.dynamic]),
+      named: dart.definiteFunctionType(compile_time_constant_arguments_test_none_multi.A, [], {a: dart.dynamic}),
+      optional: dart.definiteFunctionType(compile_time_constant_arguments_test_none_multi.A, [], [dart.dynamic])
+    })
+  });
+  let const$;
+  let const$0;
+  let const$1;
+  let const$2;
+  compile_time_constant_arguments_test_none_multi.main = function() {
+    const$ || (const$ = dart.const(new compile_time_constant_arguments_test_none_multi.A(1)));
+    const$0 || (const$0 = dart.const(new compile_time_constant_arguments_test_none_multi.A.named()));
+    const$1 || (const$1 = dart.const(new compile_time_constant_arguments_test_none_multi.A.optional()));
+    const$2 || (const$2 = dart.const(new compile_time_constant_arguments_test_none_multi.A.optional(42)));
+  };
+  dart.fn(compile_time_constant_arguments_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.compile_time_constant_arguments_test_none_multi = compile_time_constant_arguments_test_none_multi;
+});