Roll Observatory deps (charted -> ^0.3.0)

packages/dart_style/lib/src/rule/type_argument.dart

Index: packages/dart_style/lib/src/rule/type_argument.dart
diff --git a/packages/dart_style/lib/src/rule/type_argument.dart b/packages/dart_style/lib/src/rule/type_argument.dart
index ebac6c8a7b5422f3df405dd905fb604f1d950aec..8fcc11717cb8adc93b3fd6999dcbb96cc653b776 100644
--- a/packages/dart_style/lib/src/rule/type_argument.dart
+++ b/packages/dart_style/lib/src/rule/type_argument.dart
@@ -43,7 +43,7 @@ class TypeArgumentRule extends Rule {
 
   bool isSplit(int value, Chunk chunk) {
     // Don't split at all.
-    if (value == 0) return false;
+    if (value == Rule.unsplit) return false;
 
     // Split before every argument.
     if (value == numValues - 1) return true;
@@ -52,4 +52,6 @@ class TypeArgumentRule extends Rule {
     // to try to keep as much on the first line as possible.
     return chunk == _arguments[_arguments.length - value];
   }
+
+  String toString() => "TypeArg${super.toString()}";
 }