Support signed constants.

tests/compiler/dart2js/unparser_test.dart

Index: tests/compiler/dart2js/unparser_test.dart
diff --git a/tests/compiler/dart2js/unparser_test.dart b/tests/compiler/dart2js/unparser_test.dart
index 79ce4908dd8d9fa0f7233a6a9574a9edf339f143..96cf8a76fac70257ae11e55819d44579df482a02 100644
--- a/tests/compiler/dart2js/unparser_test.dart
+++ b/tests/compiler/dart2js/unparser_test.dart
@@ -75,6 +75,13 @@ testDart2DartWithLibrary(
       const ['--output-type=dart', '--unparse-validation']).then(continuation);
 }
 
+testSignedConstants() {

[Roman, 2012/07/31 07:52:12]

what about +inf, -inf, +0.0, -0.0 ?

[Anton Muhin, 2012/07/31 08:01:16]

There is no inf, zero tests are added

+  testUnparse('var x=+42;');
+  testUnparse('var x=+.42;');
+  testUnparse('var x=-42;');
+  testUnparse('var x=-.42;');
+}
+
 testGenericTypes() {
   testUnparse('var x=new List<List<int>>();');
   testUnparse('var x=new List<List<List<int>>>();');
@@ -374,6 +381,7 @@ main() {
 }
 
 main() {
+  testSignedConstants();
   testGenericTypes();
   testForLoop();
   testEmptyList();