[C++ PATCH] Fix decltype PRs

["Doug Gregor" <doug dot gregor at gmail dot com>]

This patch fixes three C++0x decltype PRs. Two of them (PR c++/33837
and PR c++/33838) are ice-on-invalid failures, which just needed a few
more checks for ERROR_MARK_NODE and NULL_TREE in the right places. The
third one (PR c++/33045) is actually a serious bug in the handling of
decltype, where we were failing to see through INDIRECT_REFs that the
front end puts in the AST, and therefore getting the decltype() of a
function call wrong.

Tested i686-pc-linux-gnu; okay for mainline?

  - Doug

2007-11-05  Douglas Gregor  <doug.gregor@gmail.com>

	PR c++/33045
	PR c++/33837
	PR c++/33838
	* semantics.c (finish_decltype_type): See through INDIRECT_REFs.
	Be careful with ERROR_MARK_NODEs.
	* parser.c (cp_parser_check_access_in_redeclaration): Handle NULL
	argument.
	
2007-11-05  Douglas Gregor  <doug.gregor@gmail.com>

	PR c++/33045
	PR c++/33837
	PR c++/33838
	* g++.dg/cpp0x/decltype-33837.C: New.
	* g++.dg/cpp0x/decltype-refbug.C: New.
	* g++.dg/cpp0x/decltype-33838.C: New.

Attachment: decltype-fixes.patch
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