Prevent accidental re-use of removed field.

PiperOrigin-RevId: 187798953

diff --git a/tensorflow/core/framework/function.proto b/tensorflow/core/framework/function.proto
index bd01e86..72e3c43 100644 (file)
--- a/tensorflow/core/framework/function.proto
+++ b/tensorflow/core/framework/function.proto
@@ -30,7 +30,8 @@ message FunctionDef {
   // Attributes specific to this function definition.
   map<string, AttrValue> attr = 5;
 
-  // NOTE: field id 2 deleted on Jan 11, 2016, GraphDef version 21.
+  // NOTE: field id 2 deleted on Jan 11, 2017, GraphDef version 21.
+  reserved 2;
 
   // In both of the following fields, there is the need to specify an
   // output that is used as either the input to another node (in