[PATCH] Fix C++ PR's 31138, 31140, 31141

[Doug Gregor]

This patch fixes two ice-on-invalid-code and one ice-on-valid-code
PR's that resulted from the  variadic templates patch.

Tested i686-pc-linux-gnu; no regressions.

Okay for mainline?

  Cheers,
  Doug

:ADDPATCH c++:

2007-03-12  Douglas Gregor  <doug.gregor@gmail.com>

	PR c++/31138
	PR c++/31140
	PR c++/31141
	* parser.c (declarator_can_be_parameter_pack): New.
	(cp_parser_template_parameter): Only parse the `...' if the
	declarator can be a parameter pack.
	(cp_parser_parameter_declaration): Ditto. Also, handle when TYPE
	is NULL.
	* pt.c (find_parameter_packs_r): Look into the bounds on integer
	types (they could be used as array bounds).
        (check_for_bare_parameter_packs): Deal with TEMPLATE_PARM_INDEX.
	(tsubst_pack_expansion): Handle failure to expand parameter
	packs.

2007-03-12  Douglas Gregor  <doug.gregor@gmail.com>

	* g++.dg/parser/pr31138.C: New.
	* g++.dg/parser/pr31140.C: New.
	* g++.dg/parser/pr31141.C: New.
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