Resolve type arguments to generic methods.

pkg/compiler/lib/src/tree/unparser.dart

Index: pkg/compiler/lib/src/tree/unparser.dart
diff --git a/pkg/compiler/lib/src/tree/unparser.dart b/pkg/compiler/lib/src/tree/unparser.dart
index 12d4141cfce3958dc2e3ee21ac316cae62f16c62..5d1d15431e2515513ebce1d29aafb3477b20b002 100644
--- a/pkg/compiler/lib/src/tree/unparser.dart
+++ b/pkg/compiler/lib/src/tree/unparser.dart
@@ -457,6 +457,7 @@ class Unparser extends Indentation implements Visitor {
       visit(argNode.receiver);
     } else {
       if (spacesNeeded) write(' ');
+      visit(node.typeArgumentsNode);

[eernst, 2016/11/30 10:39:01]

Yes! If this is used to format diagnostic messages to developers etc. then it is
definitely useful that we don't just drop the type arguments---that could be
quite confusing.

       visit(node.argumentsNode);
     }
   }