Add support to dart2js for option --enable-asserts.

tests/language/function_type/function_type92_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // GENERATED - DON'T EDIT.
 // GENERATED - DON'T EDIT.
 // GENERATED - DON'T EDIT.
 // GENERATED - DON'T EDIT.
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 import 'dart:core';
 import 'dart:core' as core;
 import 'package:expect/expect.dart';
 
 @NoInline()
 @AssumeDynamic()
 confuse(f) => f;
 
-final bool inCheckedMode = (() {
-  bool result = false;
-  assert(result = true);
-  return result;
-})();
-
-typedef F0<T>
-    = Function Function(int y, [core.List<core.int> x]);
-typedef F1<T>
-    = core.List<core.int> Function(int x0, [List<Function> x]);
-typedef F2<T>
-    = Function([Function x]);
-typedef F3<T>
-    = int Function<A>(int x);
-typedef F4<T>
-    = int Function(int x, [int x2]) Function();
-typedef F5<T>
-    = int Function(int y, {List<Function> x}) Function();
-typedef F6<T>
-    = Function Function([int x]) Function();
-typedef F7<T>
-    = Function Function(List<Function> x0) Function();
-typedef F8<T>
-    = Function Function(int x, [List<T> x2]) Function();
-typedef F9<T>
-    = List<Function> Function(int x0, {Function x}) Function();
-typedef F10<T>
-    = List<Function> Function([List<T> x]) Function();
-typedef F11<T>
-    = core.List<core.int> Function(int y, [Function x]) Function();
-typedef F12<T>
-    = core.List<core.int> Function(int x1, [core.List<core.int> x2]) Function();
-typedef F13<T>
-    = List<T> Function({int x}) Function();
-typedef F14<T>
-    = List<T> Function(core.List<core.int> x) Function();
-typedef F15<T>
-    = Function(int x0, [int x]) Function();
-typedef F16<T>
-    = Function([List<Function> x1]) Function();
-typedef F17<T>
-    = Function({List<T> x}) Function();
-typedef F18<T>
-    = void Function(int y, {Function x}) Function();
-typedef F19<T>
-    = void Function(int x0, [List<T> x]) Function();
-typedef F20<T>
-    = Function Function<A>(List<A> x) Function();
-typedef F21<T>
-    = Function<A>(int x) Function();
-typedef F22<T>
-    = void Function<A>(Function x) Function();
+typedef F0<T> = Function Function(int y, [core.List<core.int> x]);
+typedef F1<T> = core.List<core.int> Function(int x0, [List<Function> x]);
+typedef F2<T> = Function([Function x]);
+typedef F3<T> = int Function<A>(int x);
+typedef F4<T> = int Function(int x, [int x2]) Function();
+typedef F5<T> = int Function(int y, {List<Function> x}) Function();
+typedef F6<T> = Function Function([int x]) Function();
+typedef F7<T> = Function Function(List<Function> x0) Function();
+typedef F8<T> = Function Function(int x, [List<T> x2]) Function();
+typedef F9<T> = List<Function> Function(int x0, {Function x}) Function();
+typedef F10<T> = List<Function> Function([List<T> x]) Function();
+typedef F11<T> = core.List<core.int> Function(int y, [Function x]) Function();
+typedef F12<T> = core.List<core.int> Function(int x1, [core.List<core.int> x2])
+    Function();
+typedef F13<T> = List<T> Function({int x}) Function();
+typedef F14<T> = List<T> Function(core.List<core.int> x) Function();
+typedef F15<T> = Function(int x0, [int x]) Function();
+typedef F16<T> = Function([List<Function> x1]) Function();
+typedef F17<T> = Function({List<T> x}) Function();
+typedef F18<T> = void Function(int y, {Function x}) Function();
+typedef F19<T> = void Function(int x0, [List<T> x]) Function();
+typedef F20<T> = Function Function<A>(List<A> x) Function();
+typedef F21<T> = Function<A>(int x) Function();
+typedef F22<T> = void Function<A>(Function x) Function();
 
 Function f0(int y, [core.List<core.int> x]) => null;
 core.List<core.int> f1(int x0, [List<Function> x]) => null;
 f2([Function x]) => null;
 int f3<A>(int x) => null;
 int Function(int x, [int x0]) f4() => null;
 int Function(int y, {List<Function> x}) f5() => null;
 Function Function([int x]) f6() => null;
 Function Function(List<Function> x0) f7() => null;
 Function Function(int x, [List<int> x0]) f8() => null;
@@ skipping 310 matching lines @@
     x8 = confuse(m8);
     l8 = confuse(m8);
     if (!tIsBool) {
       Expect.isTrue(f8 is F8<int>);
       Expect.isFalse(f8 is F8<bool>);
       Expect.isTrue(confuse(f8) is F8<int>);
       Expect.isFalse(confuse(f8) is F8<bool>);
       Expect.equals(tIsDynamic, m8 is F8<bool>);
       Expect.equals(tIsDynamic, confuse(m8) is F8<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x8 = (f8 as dynamic);
         });
         Expect.throws(() {
           x8 = confuse(f8);
         });
         Function Function(int x, [List<T> x2]) Function() l8;
         Expect.throws(() {
           l8 = (f8 as dynamic);
         });
@@ skipping 56 matching lines @@
     x10 = confuse(m10);
     l10 = confuse(m10);
     if (!tIsBool) {
       Expect.isTrue(f10 is F10<int>);
       Expect.isFalse(f10 is F10<bool>);
       Expect.isTrue(confuse(f10) is F10<int>);
       Expect.isFalse(confuse(f10) is F10<bool>);
       Expect.equals(tIsDynamic, m10 is F10<bool>);
       Expect.equals(tIsDynamic, confuse(m10) is F10<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x10 = (f10 as dynamic);
         });
         Expect.throws(() {
           x10 = confuse(f10);
         });
         List<Function> Function([List<T> x]) Function() l10;
         Expect.throws(() {
           l10 = (f10 as dynamic);
         });
@@ skipping 43 matching lines @@
     // The static function f12 sets `T` to `int`.
     if (!tIsBool) {
       x12 = f12 as dynamic;
       l12 = f12 as dynamic;
       x12 = confuse(f12);
       l12 = confuse(f12);
     }
 
     Expect.isTrue(m12 is F12);
     Expect.isTrue(m12 is core.List<core.int> Function(int x1,
-        [core.List<core.int> x2]) Function());
+            [core.List<core.int> x2])
+        Function());
     Expect.isTrue(confuse(m12) is F12);
     // In checked mode, verifies the type.
     x12 = m12;
     l12 = m12;
     x12 = confuse(m12);
     l12 = confuse(m12);
   }
 
   /// List<T> Function({int x}) Function()
   void testF13() {
@@ skipping 18 matching lines @@
     x13 = confuse(m13);
     l13 = confuse(m13);
     if (!tIsBool) {
       Expect.isTrue(f13 is F13<int>);
       Expect.isFalse(f13 is F13<bool>);
       Expect.isTrue(confuse(f13) is F13<int>);
       Expect.isFalse(confuse(f13) is F13<bool>);
       Expect.equals(tIsDynamic, m13 is F13<bool>);
       Expect.equals(tIsDynamic, confuse(m13) is F13<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x13 = (f13 as dynamic);
         });
         Expect.throws(() {
           x13 = confuse(f13);
         });
         List<T> Function({int x}) Function() l13;
         Expect.throws(() {
           l13 = (f13 as dynamic);
         });
@@ skipping 31 matching lines @@
     x14 = confuse(m14);
     l14 = confuse(m14);
     if (!tIsBool) {
       Expect.isTrue(f14 is F14<int>);
       Expect.isFalse(f14 is F14<bool>);
       Expect.isTrue(confuse(f14) is F14<int>);
       Expect.isFalse(confuse(f14) is F14<bool>);
       Expect.equals(tIsDynamic, m14 is F14<bool>);
       Expect.equals(tIsDynamic, confuse(m14) is F14<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x14 = (f14 as dynamic);
         });
         Expect.throws(() {
           x14 = confuse(f14);
         });
         List<T> Function(core.List<core.int> x) Function() l14;
         Expect.throws(() {
           l14 = (f14 as dynamic);
         });
@@ skipping 79 matching lines @@
     x17 = confuse(m17);
     l17 = confuse(m17);
     if (!tIsBool) {
       Expect.isTrue(f17 is F17<int>);
       Expect.isFalse(f17 is F17<bool>);
       Expect.isTrue(confuse(f17) is F17<int>);
       Expect.isFalse(confuse(f17) is F17<bool>);
       Expect.equals(tIsDynamic, m17 is F17<bool>);
       Expect.equals(tIsDynamic, confuse(m17) is F17<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x17 = (f17 as dynamic);
         });
         Expect.throws(() {
           x17 = confuse(f17);
         });
         Function({List<T> x}) Function() l17;
         Expect.throws(() {
           l17 = (f17 as dynamic);
         });
@@ skipping 55 matching lines @@
     x19 = confuse(m19);
     l19 = confuse(m19);
     if (!tIsBool) {
       Expect.isTrue(f19 is F19<int>);
       Expect.isFalse(f19 is F19<bool>);
       Expect.isTrue(confuse(f19) is F19<int>);
       Expect.isFalse(confuse(f19) is F19<bool>);
       Expect.equals(tIsDynamic, m19 is F19<bool>);
       Expect.equals(tIsDynamic, confuse(m19) is F19<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x19 = (f19 as dynamic);
         });
         Expect.throws(() {
           x19 = confuse(f19);
         });
         void Function(int x0, [List<T> x]) Function() l19;
         Expect.throws(() {
           l19 = (f19 as dynamic);
         });
@@ skipping 79 matching lines @@
     x22 = confuse(m22);
     l22 = confuse(m22);
   }
 }
 
 void main() {
   new U92().runTests();
   new U92<int>(tIsInt: true).runTests();
   new U92<bool>(tIsBool: true).runTests();
 }