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

tests/language/function_type/function_type64_test.dart

Index: tests/language/function_type/function_type64_test.dart
diff --git a/tests/language/function_type/function_type64_test.dart b/tests/language/function_type/function_type64_test.dart
index 0a9498b3433375d5cac8924daf4e9ec34235e03f..e202bbe679d531be005e5b59459e688fa9d0c581 100644
--- a/tests/language/function_type/function_type64_test.dart
+++ b/tests/language/function_type/function_type64_test.dart
@@ -19,58 +19,30 @@ import 'package:expect/expect.dart';
 @AssumeDynamic()
 confuse(f) => f;
 
-final bool inCheckedMode = (() {
-  bool result = false;
-  assert(result = true);
-  return result;
-})();
-
-typedef F0<T>
-    = Function Function({int x});
-typedef F1<T>
-    = List<Function> Function({List<T> x});
-typedef F2<T>
-    = List<T> Function(int x, [core.List<core.int> x2]);
-typedef F3<T>
-    = void Function(int x1, [List<Function> x2]);
-typedef F4<T>
-    = int Function(int x) Function();
-typedef F5<T>
-    = int Function(int y, [List<Function> x]) Function();
-typedef F6<T>
-    = int Function(int x1, [List<T> x2]) Function();
-typedef F7<T>
-    = Function Function({Function x}) Function();
-typedef F8<T>
-    = Function Function(List<T> x) Function();
-typedef F9<T>
-    = List<Function> Function(int x0, [Function x]) Function();
-typedef F10<T>
-    = List<Function> Function([core.List<core.int> x1]) Function();
-typedef F11<T>
-    = core.List<core.int> Function(int x, [int x2]) Function();
-typedef F12<T>
-    = core.List<core.int> Function(int y, {List<Function> x}) Function();
-typedef F13<T>
-    = List<T> Function([int x]) Function();
-typedef F14<T>
-    = List<T> Function(List<Function> x0) Function();
-typedef F15<T>
-    = List<T> Function(int x, [List<T> x2]) Function();
-typedef F16<T>
-    = Function(int x0, {Function x}) 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 x1, [core.List<core.int> x2]) Function();
-typedef F20<T>
-    = Function Function<A>(int x) Function();
-typedef F21<T>
-    = List<T> Function<A>(Function x) Function();
-typedef F22<T>
-    = List<A> Function<A>(List<Function> x) Function();
+typedef F0<T> = Function Function({int x});
+typedef F1<T> = List<Function> Function({List<T> x});
+typedef F2<T> = List<T> Function(int x, [core.List<core.int> x2]);
+typedef F3<T> = void Function(int x1, [List<Function> x2]);
+typedef F4<T> = int Function(int x) Function();
+typedef F5<T> = int Function(int y, [List<Function> x]) Function();
+typedef F6<T> = int Function(int x1, [List<T> x2]) Function();
+typedef F7<T> = Function Function({Function x}) Function();
+typedef F8<T> = Function Function(List<T> x) Function();
+typedef F9<T> = List<Function> Function(int x0, [Function x]) Function();
+typedef F10<T> = List<Function> Function([core.List<core.int> x1]) Function();
+typedef F11<T> = core.List<core.int> Function(int x, [int x2]) Function();
+typedef F12<T> = core.List<core.int> Function(int y, {List<Function> x})
+    Function();
+typedef F13<T> = List<T> Function([int x]) Function();
+typedef F14<T> = List<T> Function(List<Function> x0) Function();
+typedef F15<T> = List<T> Function(int x, [List<T> x2]) Function();
+typedef F16<T> = Function(int x0, {Function x}) 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 x1, [core.List<core.int> x2]) Function();
+typedef F20<T> = Function Function<A>(int x) Function();
+typedef F21<T> = List<T> Function<A>(Function x) Function();
+typedef F22<T> = List<A> Function<A>(List<Function> x) Function();
 
 Function f0({int x}) => null;
 List<Function> f1({List<int> x}) => null;
@@ -232,7 +204,7 @@ class U64<T> {
       Expect.equals(tIsDynamic, m1 is F1<bool>);
       Expect.equals(tIsDynamic, confuse(m1) is F1<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x1 = (f1 as dynamic);
         });
@@ -284,7 +256,7 @@ class U64<T> {
       Expect.equals(tIsDynamic, m2 is F2<bool>);
       Expect.equals(tIsDynamic, confuse(m2) is F2<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x2 = (f2 as dynamic);
         });
@@ -408,7 +380,7 @@ class U64<T> {
       Expect.equals(tIsDynamic, m6 is F6<bool>);
       Expect.equals(tIsDynamic, confuse(m6) is F6<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x6 = (f6 as dynamic);
         });
@@ -484,7 +456,7 @@ class U64<T> {
       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);
         });
@@ -596,8 +568,8 @@ class U64<T> {
     }
 
     Expect.isTrue(m12 is F12);
-    Expect.isTrue(m12 is core.List<core.int> Function(int y,
-        {List<Function> x}) Function());
+    Expect.isTrue(m12 is core.List<core.int> Function(int y, {List<Function> x})
+        Function());
     Expect.isTrue(confuse(m12) is F12);
     // In checked mode, verifies the type.
     x12 = m12;
@@ -636,7 +608,7 @@ class U64<T> {
       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);
         });
@@ -688,7 +660,7 @@ class U64<T> {
       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);
         });
@@ -740,7 +712,7 @@ class U64<T> {
       Expect.equals(tIsDynamic, m15 is F15<bool>);
       Expect.equals(tIsDynamic, confuse(m15) is F15<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x15 = (f15 as dynamic);
         });
@@ -816,7 +788,7 @@ class U64<T> {
       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);
         });
@@ -941,7 +913,7 @@ class U64<T> {
       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);
         });