I added a new macro to replace the use of TREE_TYPE to get constraints. It's called TEMPLATE_PARMS_CONSTRAINTS. Patch attached:
2013-09-10 Andrew Sutton <andrew.n.sut...@gmail.com> * gcc/cp/cp-tree.h (TEMPLATE_PARMS_CONSTRAINTS): New. * gcc/cp/parser.c (cp_parser_template_declaration_after_export), (cp_parser_type_parameter): Use TEMPLATE_PARMS_CONSTRAINTS. * gcc/cp/semantics.c (fixup_template_scope): Use TEMPLATE_PARMS_CONSTRAINTS. Andrew Sutton
template-parms.patch
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