glr.c: example: use a printer

Akim Demaille <[email protected]> Sun, 3 Jan 2021 08:15:32 +0100

Newsgroups	gmane.comp.parsers.bison.patches
Message-ID	<[email protected]>

commit c1884d300267b4eaec33f448d0a9f1b211d18a01
Author: Akim Demaille <[email protected]>
Date:   Sun Jan 3 06:57:39 2021 +0100

    glr.c: example: use a printer
    
    * examples/c++/glr/c++-types.yy: Here.

diff --git a/examples/c++/glr/c++-types.yy b/examples/c++/glr/c++-types.yy
index 266bd100..8399b4f9 100644
--- a/examples/c++/glr/c++-types.yy
+++ b/examples/c++/glr/c++-types.yy
@@ -60,6 +60,8 @@
   TYPENAME "typename"
   ID "identifier"
 
+%printer { yyo << $$; } TYPENAME ID stmt expr decl declarator
+
 %right '='
 %left '+'