--- old/src/jdk.jextract/share/classes/com/sun/tools/jextract/tree/StructTree.java	2018-09-19 19:35:36.000000000 +0530
+++ new/src/jdk.jextract/share/classes/com/sun/tools/jextract/tree/StructTree.java	2018-09-19 19:35:36.000000000 +0530
@@ -56,6 +56,7 @@
         return new StructTree(cursor(), definition, newDecls, newName);
     }
 
+    // definition of this struct if available anywhere in the compilation unit
     public Optional<Tree> definition() {
         return definition;
     }