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

tests/language/function_type/function_type56_test.dart

Index: tests/language/function_type/function_type56_test.dart
diff --git a/tests/language/function_type/function_type56_test.dart b/tests/language/function_type/function_type56_test.dart
index 8f8558315913f976a7006d97c32e2fb4a6eeced8..c33ffbf129f136488bda99953001576f2e2e4d16 100644
--- a/tests/language/function_type/function_type56_test.dart
+++ b/tests/language/function_type/function_type56_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 y, {List<Function> x});
-typedef F3<T>
-    = void Function(int x0, {Function x});
-typedef F4<T>
-    = void Function<A>(int x);
-typedef F5<T>
-    = int Function([List<Function> x]) Function();
-typedef F6<T>
-    = int Function(List<T> x0) Function();
-typedef F7<T>
-    = Function Function(int x1, [Function x2]) Function();
-typedef F8<T>
-    = Function Function(int x0, {core.List<core.int> x}) Function();
-typedef F9<T>
-    = List<Function> Function(Function x) Function();
-typedef F10<T>
-    = List<Function> Function(int y, [core.List<core.int> x]) Function();
-typedef F11<T>
-    = core.List<core.int> Function([int x1]) Function();
-typedef F12<T>
-    = core.List<core.int> Function({List<Function> x}) Function();
-typedef F13<T>
-    = core.List<core.int> Function() Function();
-typedef F14<T>
-    = List<T> Function(int x0, [List<Function> x]) Function();
-typedef F15<T>
-    = List<T> Function([List<T> x1]) Function();
-typedef F16<T>
-    = Function(int x, [Function x2]) Function();
-typedef F17<T>
-    = Function(int y, {core.List<core.int> x}) Function();
-typedef F18<T>
-    = void Function([Function x]) Function();
-typedef F19<T>
-    = void Function(core.List<core.int> x0) Function();
-typedef F20<T>
-    = int Function<A>(A x) Function();
-typedef F21<T>
-    = core.List<core.int> Function<A>(List<A> x) Function();
-typedef F22<T>
-    = List<A> Function<A>(int 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 y, {List<Function> x});
+typedef F3<T> = void Function(int x0, {Function x});
+typedef F4<T> = void Function<A>(int x);
+typedef F5<T> = int Function([List<Function> x]) Function();
+typedef F6<T> = int Function(List<T> x0) Function();
+typedef F7<T> = Function Function(int x1, [Function x2]) Function();
+typedef F8<T> = Function Function(int x0, {core.List<core.int> x}) Function();
+typedef F9<T> = List<Function> Function(Function x) Function();
+typedef F10<T> = List<Function> Function(int y, [core.List<core.int> x])
+    Function();
+typedef F11<T> = core.List<core.int> Function([int x1]) Function();
+typedef F12<T> = core.List<core.int> Function({List<Function> x}) Function();
+typedef F13<T> = core.List<core.int> Function() Function();
+typedef F14<T> = List<T> Function(int x0, [List<Function> x]) Function();
+typedef F15<T> = List<T> Function([List<T> x1]) Function();
+typedef F16<T> = Function(int x, [Function x2]) Function();
+typedef F17<T> = Function(int y, {core.List<core.int> x}) Function();
+typedef F18<T> = void Function([Function x]) Function();
+typedef F19<T> = void Function(core.List<core.int> x0) Function();
+typedef F20<T> = int Function<A>(A x) Function();
+typedef F21<T> = core.List<core.int> Function<A>(List<A> x) Function();
+typedef F22<T> = List<A> Function<A>(int x) Function();
 
 Function f0(int x) => null;
 List<Function> f1(List<int> x) => null;
@@ -232,7 +204,7 @@ class U56<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 U56<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 U56<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);
         });
@@ -518,8 +490,8 @@ class U56<T> {
     }
 
     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;
@@ -632,7 +604,7 @@ class U56<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);
         });
@@ -684,7 +656,7 @@ class U56<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);
         });