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

tests/language/function_type/function_type25_test.dart

Index: tests/language/function_type/function_type25_test.dart
diff --git a/tests/language/function_type/function_type25_test.dart b/tests/language/function_type/function_type25_test.dart
index 6ee5d165e1f00c8c706cd0fa0d7b1d3718a3e13e..189104a544f7eb6ef9b17f8fa4d9aca92fffbbc6 100644
--- a/tests/language/function_type/function_type25_test.dart
+++ b/tests/language/function_type/function_type25_test.dart
@@ -19,60 +19,33 @@ import 'package:expect/expect.dart';
 @AssumeDynamic()
 confuse(f) => f;
 
-final bool inCheckedMode = (() {
-  bool result = false;
-  assert(result = true);
-  return result;
-})();
-
-typedef F0<T>
-    = int Function(int y, [List<Function> x]);
-typedef F1<T>
-    = List<Function> Function(int x0, [Function x]);
-typedef F2<T>
-    = List<T> Function([int x]);
-typedef F3<T>
-    = Function([List<T> x]);
-typedef F4<T>
-    = List<T> Function<A>(Function x);
-typedef F5<T>
-    = int Function(Function x1) Function(int x);
-typedef F6<T>
-    = int Function(int x, [core.List<core.int> x1]) Function(int x);
-typedef F7<T>
-    = Function Function(int x1, {int x}) Function(int x);
-typedef F8<T>
-    = Function Function([core.List<core.int> x]) Function(int x);
-typedef F9<T>
-    = List<Function> Function(int y, [int x]) Function(int x);
-typedef F10<T>
-    = List<Function> Function(int x2, [List<Function> x3]) Function(int x);
-typedef F11<T>
-    = List<Function> Function(int x1, {List<T> x}) Function(int x);
-typedef F12<T>
-    = core.List<core.int> Function(List<Function> x) Function(int x);
-typedef F13<T>
-    = core.List<core.int> Function(int y, [List<T> x]) Function(int x);
-typedef F14<T>
-    = List<T> Function([Function x1]) Function(int x);
-typedef F15<T>
-    = List<T> Function({core.List<core.int> x}) Function(int x);
-typedef F16<T>
-    = Function(int y, {int x}) Function(int x);
-typedef F17<T>
-    = Function(int x1, [core.List<core.int> x]) Function(int x);
-typedef F18<T>
-    = void Function(int x1) Function(int x);
-typedef F19<T>
-    = void Function(int x, [List<Function> x1]) Function(int x);
-typedef F20<T>
-    = void Function(int y, {List<T> x}) Function(int x);
-typedef F21<T>
-    = List<Function> Function<A>(List<A> x) Function(int x);
-typedef F22<T>
-    = A Function<A>(int x) Function(int x);
-typedef F23<T>
-    = List<Function> Function(B x) Function<B extends core.int>(int x);
+typedef F0<T> = int Function(int y, [List<Function> x]);
+typedef F1<T> = List<Function> Function(int x0, [Function x]);
+typedef F2<T> = List<T> Function([int x]);
+typedef F3<T> = Function([List<T> x]);
+typedef F4<T> = List<T> Function<A>(Function x);
+typedef F5<T> = int Function(Function x1) Function(int x);
+typedef F6<T> = int Function(int x, [core.List<core.int> x1]) Function(int x);
+typedef F7<T> = Function Function(int x1, {int x}) Function(int x);
+typedef F8<T> = Function Function([core.List<core.int> x]) Function(int x);
+typedef F9<T> = List<Function> Function(int y, [int x]) Function(int x);
+typedef F10<T> = List<Function> Function(int x2, [List<Function> x3]) Function(
+    int x);
+typedef F11<T> = List<Function> Function(int x1, {List<T> x}) Function(int x);
+typedef F12<T> = core.List<core.int> Function(List<Function> x) Function(int x);
+typedef F13<T> = core.List<core.int> Function(int y, [List<T> x]) Function(
+    int x);
+typedef F14<T> = List<T> Function([Function x1]) Function(int x);
+typedef F15<T> = List<T> Function({core.List<core.int> x}) Function(int x);
+typedef F16<T> = Function(int y, {int x}) Function(int x);
+typedef F17<T> = Function(int x1, [core.List<core.int> x]) Function(int x);
+typedef F18<T> = void Function(int x1) Function(int x);
+typedef F19<T> = void Function(int x, [List<Function> x1]) Function(int x);
+typedef F20<T> = void Function(int y, {List<T> x}) Function(int x);
+typedef F21<T> = List<Function> Function<A>(List<A> x) Function(int x);
+typedef F22<T> = A Function<A>(int x) Function(int x);
+typedef F23<T> = List<Function> Function(B x) Function<B extends core.int>(
+    int x);
 
 int f0(int y, [List<Function> x]) => null;
 List<Function> f1(int x0, [Function x]) => null;
@@ -262,7 +235,7 @@ class U25<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);
         });
@@ -314,7 +287,7 @@ class U25<T> {
       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);
         });
@@ -366,7 +339,7 @@ class U25<T> {
       Expect.equals(tIsDynamic, m4 is F4<bool>);
       Expect.equals(tIsDynamic, confuse(m4) is F4<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x4 = (f4 as dynamic);
         });
@@ -526,8 +499,8 @@ class U25<T> {
     }
 
     Expect.isTrue(m10 is F10);
-    Expect.isTrue(m10 is List<Function> Function(int x2,
-        [List<Function> x3]) Function(int x));
+    Expect.isTrue(m10 is List<Function> Function(int x2, [List<Function> x3])
+        Function(int x));
     Expect.isTrue(confuse(m10) is F10);
     // In checked mode, verifies the type.
     x10 = m10;
@@ -567,7 +540,7 @@ class U25<T> {
       Expect.equals(tIsDynamic, m11 is F11<bool>);
       Expect.equals(tIsDynamic, confuse(m11) is F11<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x11 = (f11 as dynamic);
         });
@@ -629,8 +602,8 @@ class U25<T> {
     }
 
     Expect.isTrue(m13 is F13);
-    Expect.isTrue(m13 is core.List<core.int> Function(int y,
-        [List<T> x]) Function(int x));
+    Expect.isTrue(m13 is core.List<core.int> Function(int y, [List<T> x])
+        Function(int x));
     Expect.isTrue(confuse(m13) is F13);
     // In checked mode, verifies the type.
     x13 = m13;
@@ -645,7 +618,7 @@ class U25<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);
         });
@@ -698,7 +671,7 @@ class U25<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);
         });
@@ -751,7 +724,7 @@ class U25<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);
         });
@@ -901,7 +874,7 @@ class U25<T> {
       Expect.equals(tIsDynamic, m20 is F20<bool>);
       Expect.equals(tIsDynamic, confuse(m20) is F20<bool>);
     } else {
-      if (inCheckedMode) {
+      if (typeAssertionsEnabled) {
         Expect.throws(() {
           x20 = (f20 as dynamic);
         });
@@ -986,8 +959,8 @@ class U25<T> {
     }
 
     Expect.isTrue(m23 is F23);
-    Expect.isTrue(m23 is List<Function> Function(
-        B x) Function<B extends core.int>(int x));
+    Expect.isTrue(m23 is List<Function> Function(B x)
+        Function<B extends core.int>(int x));
     Expect.isTrue(confuse(m23) is F23);
     // In checked mode, verifies the type.
     x23 = m23;