re PR c++/51184 (Abstract class in function return type)

re PR c++/51184 (Abstract class in function return type)

/cp
2012-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51184
	* decl.c (grokdeclarator): Diagnose functions returning abstract
	class types as TYPENAME.
	* cp-tree.h (ABSTRACT_CLASS_TYPE_P): Add.
	* except.c (is_admissible_throw_operand_or_catch_parameter): Use it.
	* pt.c (tsubst): Likewise.
	* semantics.c (trait_expr_value): Likewise.

/testsuite
2012-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51184
	* g++.dg/other/abstract4.C: New-

/cp
2012-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/40821
	* parser.c (cp_parser_attributes_opt): Enforce error checking of
	unbalanced parentheses in the presence of tentative parsing.

/testsuite
2012-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/40821
	* g++.dg/ext/attrib46.C: New.

From-SVN: r187720