On Sun, 2010-03-14 at 14:00 -0400, Diego Novillo wrote: tree.c:build_common_tree_nodes. The initialization is hidden because it's done via the #define symbols associated with each entry of global_trees[]. Diego. Thanks Diego. Seems somewhat wrong way around, but then. The one that was worrying me was va_list_type_node, which does not seem to be mentioned. Does the language front end have to fill in the missing squares? Steve