Deprecate ToSourceVisitor

pkg/analyzer/lib/src/dart/ast/utilities.dart

Index: pkg/analyzer/lib/src/dart/ast/utilities.dart
diff --git a/pkg/analyzer/lib/src/dart/ast/utilities.dart b/pkg/analyzer/lib/src/dart/ast/utilities.dart
index a1e5448e20f82238f8b8818f8fac8e1d1170877b..654772c5f6e6190509861ce57111b67e60adda48 100644
--- a/pkg/analyzer/lib/src/dart/ast/utilities.dart
+++ b/pkg/analyzer/lib/src/dart/ast/utilities.dart
@@ -6769,7 +6769,10 @@ class ScopedNameFinder extends GeneralizingAstVisitor<Object> {
 /**
  * A visitor used to write a source representation of a visited AST node (and
  * all of it's children) to a writer.
+ *
+ * This class has been deprecated. Use the class ToSourceVisitor2 instead.
  */
+@deprecated
 class ToSourceVisitor implements AstVisitor<Object> {
   /**
    * The writer to which the source is to be written.