This shows that it would be interesting to manage to install skeleton
coverage analysis to the test suite.
+** Table definitions
+It should be very easy to factor the definition of the various tables,
+including the separation bw declaration and definition. See for
+instance b4_table_define in lalr1.cc. This way, we could even factor
+C vs. C++ definitions.
+
* Header guards
From Franc,ois: should we keep the directory part in the CPP guard?