[Bug c++/85976] ICE in cp_tree_equal when building Blitz. May be nested templates.

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85976

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Perhaps cp_tree_equal should just handle USING_DECL like other DECLs.