Index: src/SynTree/Declaration.h
===================================================================
--- src/SynTree/Declaration.h	(revision 8b7ee0974cc08327cc6c696da347e0f8d3d1f50c)
+++ src/SynTree/Declaration.h	(revision 390630115fa35ef925f9e8e3037ed8611c6097c0)
@@ -279,5 +279,5 @@
 };
 
-std::ostream & operator<<( std::ostream & out, Declaration * decl );
+std::ostream & operator<<( std::ostream & out, const Declaration * decl );
 
 #endif // DECLARATION_H