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

tests/language/function_type/function_type84_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 x1, [List<Function> x2]);
-typedef F1<T>
-    = core.List<core.int> Function([Function x1]);
-typedef F2<T>
-    = Function(int x0);
-typedef F3<T>
-    = void Function(List<T> x0);
-typedef F4<T>
-    = int Function([int x1]) Function();
-typedef F5<T>
-    = int Function({List<Function> x}) Function();
-typedef F6<T>
-    = int Function() Function();
-typedef F7<T>
-    = Function Function(int x0, [List<Function> x]) Function();
-typedef F8<T>
-    = Function Function([List<T> x1]) Function();
-typedef F9<T>
-    = List<Function> Function(int x, [Function x2]) Function();
-typedef F10<T>
-    = List<Function> Function(int y, {core.List<core.int> x}) Function();
-typedef F11<T>
-    = core.List<core.int> Function([Function x]) Function();
-typedef F12<T>
-    = core.List<core.int> Function(core.List<core.int> x0) Function();
-typedef F13<T>
-    = List<T> Function(int x1, [int x2]) Function();
-typedef F14<T>
-    = List<T> Function(int x0, {List<Function> x}) Function();
-typedef F15<T>
-    = Function(int x) Function();
-typedef F16<T>
-    = Function(int y, [List<Function> x]) Function();
-typedef F17<T>
-    = Function(int x1, [List<T> x2]) Function();
-typedef F18<T>
-    = void Function({Function x}) Function();
-typedef F19<T>
-    = void Function(List<T> x) Function();
-typedef F20<T>
-    = Function Function<A>() Function();
-typedef F21<T>
-    = List<T> Function<A>(A x) Function();
-typedef F22<T>
-    = List<A> Function<A>(List<A> x) Function();
+typedef F0<T> = Function Function(int x1, [List<Function> x2]);
+typedef F1<T> = core.List<core.int> Function([Function x1]);
+typedef F2<T> = Function(int x0);
+typedef F3<T> = void Function(List<T> x0);
+typedef F4<T> = int Function([int x1]) Function();
+typedef F5<T> = int Function({List<Function> x}) Function();
+typedef F6<T> = int Function() Function();
+typedef F7<T> = Function Function(int x0, [List<Function> x]) Function();
+typedef F8<T> = Function Function([List<T> x1]) Function();
+typedef F9<T> = List<Function> Function(int x, [Function x2]) Function();
+typedef F10<T> = List<Function> Function(int y, {core.List<core.int> x})
+    Function();
+typedef F11<T> = core.List<core.int> Function([Function x]) Function();
+typedef F12<T> = core.List<core.int> Function(core.List<core.int> x0)
+    Function();
+typedef F13<T> = List<T> Function(int x1, [int x2]) Function();
+typedef F14<T> = List<T> Function(int x0, {List<Function> x}) Function();
+typedef F15<T> = Function(int x) Function();
+typedef F16<T> = Function(int y, [List<Function> x]) Function();
+typedef F17<T> = Function(int x1, [List<T> x2]) Function();
+typedef F18<T> = void Function({Function x}) Function();
+typedef F19<T> = void Function(List<T> x) Function();
+typedef F20<T> = Function Function<A>() Function();
+typedef F21<T> = List<T> Function<A>(A x) Function();
+typedef F22<T> = List<A> Function<A>(List<A> x) Function();
 
 Function f0(int x0, [List<Function> x1]) => null;
 core.List<core.int> f1([Function x0]) => null;
 f2(int x0) => null;
 void f3(List<int> x0) => null;
 int Function([int x0]) f4() => null;
 int Function({List<Function> x}) f5() => null;
 int Function() f6() => null;
 Function Function(int x0, [List<Function> x]) f7() => null;
 Function Function([List<int> x0]) f8() => null;
@@ skipping 189 matching lines @@
     x3 = confuse(m3);
     l3 = confuse(m3);
     if (!tIsBool) {
       Expect.isTrue(f3 is F3<int>);
       Expect.isFalse(f3 is F3<bool>);
       Expect.isTrue(confuse(f3) is F3<int>);
       Expect.isFalse(confuse(f3) is F3<bool>);
       Expect.equals(tIsDynamic, m3 is F3<bool>);
       Expect.equals(tIsDynamic, confuse(m3) is F3<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x3 = (f3 as dynamic);
         });
         Expect.throws(() {
           x3 = confuse(f3);
         });
         void Function(List<T> x0) l3;
         Expect.throws(() {
           l3 = (f3 as dynamic);
         });
@@ skipping 128 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([List<T> x1]) Function() l8;
         Expect.throws(() {
           l8 = (f8 as dynamic);
         });
@@ skipping 41 matching lines @@
     List<Function> Function(int y, {core.List<core.int> x}) Function() l10;
     // The static function f10 sets `T` to `int`.
     if (!tIsBool) {
       x10 = f10 as dynamic;
       l10 = f10 as dynamic;
       x10 = confuse(f10);
       l10 = confuse(f10);
     }
 
     Expect.isTrue(m10 is F10);
-    Expect.isTrue(m10 is List<Function> Function(int y,
-        {core.List<core.int> x}) Function());
+    Expect.isTrue(m10 is List<Function> Function(int y, {core.List<core.int> x})
+        Function());
     Expect.isTrue(confuse(m10) is F10);
     // In checked mode, verifies the type.
     x10 = m10;
     l10 = m10;
     x10 = confuse(m10);
     l10 = confuse(m10);
   }
 
   /// core.List<core.int> Function([Function x]) Function()
   void testF11() {
@@ skipping 67 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 x1, [int x2]) Function() l13;
         Expect.throws(() {
           l13 = (f13 as dynamic);
         });
@@ skipping 32 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(int x0, {List<Function> 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(int x1, [List<T> x2]) 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(List<T> x) Function() l19;
         Expect.throws(() {
           l19 = (f19 as dynamic);
         });
@@ skipping 55 matching lines @@
     x21 = confuse(m21);
     l21 = confuse(m21);
     if (!tIsBool) {
       Expect.isTrue(f21 is F21<int>);
       Expect.isFalse(f21 is F21<bool>);
       Expect.isTrue(confuse(f21) is F21<int>);
       Expect.isFalse(confuse(f21) is F21<bool>);
       Expect.equals(tIsDynamic, m21 is F21<bool>);
       Expect.equals(tIsDynamic, confuse(m21) is F21<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x21 = (f21 as dynamic);
         });
         Expect.throws(() {
           x21 = confuse(f21);
         });
         List<T> Function<A>(A x) Function() l21;
         Expect.throws(() {
           l21 = (f21 as dynamic);
         });
@@ skipping 31 matching lines @@
     x22 = confuse(m22);
     l22 = confuse(m22);
   }
 }
 
 void main() {
   new U84().runTests();
   new U84<int>(tIsInt: true).runTests();
   new U84<bool>(tIsBool: true).runTests();
 }