* Makefile.in (error.o): Depends on diagnostic.h

	* cp-tree.h (problematic_instantiation_changed,
	record_last_problematic_instantiation, current_instantiation,
	print_instantiation_context): Declare.
	(maybe_print_template_context): Remove.

	* decl.c (init_decl_processing): Set print_error_function to NULL.
	(lang_print_error_function): Remove, since we're using a new
	machinery.

	* error.c: #include diagnostic.h
	(function_category): New function.
	(cp_diagnostic_starter): Likewise.
	(cp_diagnostic_finalizer): Likewise.
	(cp_print_error_function): Likewise.
	(maybe_print_instantiation_context): Likewise.
	(print_instantiation_full_context): Likewise.
	(print_instantiation_partial_context): Likewise.
	(print_instantiation_context): Define.
	(init_error): Initialize diagnostic pager and finalizer.

	* pt.c (problematic_instantiation_changed): Define.
	(record_last_problematic_instantiation): Likewise.
	(current_instantiation): Likewise.
	(maybe_print_template_context): Remove.
	(print_template_context): Likewise.
	(current_tinst_level): Make static to reflect Brendan Kehoe's
	change of 1995-04-13.
	(push_tinst_level): Call print_instantiation_context.

From-SVN: r35893