re PR c++/25895 (wrong code with ?: and derived class pointers)
PR c++/25895
* class.c (build_base_path): Generate a NOP_EXPR instead of a
COMPONENT_REF if the base and derived classes are at the same
address.
PR c++/25856
* decl.c (begin_destructor_body): Robustify.
PR c++/25858
* parser.c (cp_parser_direct_declarator): Robustify.
PR c++/25895
* g++.dg/inherit/conv2.C: New test.
PR c++/25856
* g++.dg/parse/dtor7.C: New test.
PR c++/25858
* g++.dg/template/crash44.C: New test.