re PR c++/84588 (internal compiler error: Segmentation fault (contains_struct_check()))

re PR c++/84588 (internal compiler error: Segmentation fault (contains_struct_check()))

/cp
2018-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84588
	* parser.c (cp_parser_maybe_commit_to_declaration,
	cp_parser_check_condition_declarator): New.
	(cp_parser_simple_declaration): Use the first above.
	(cp_parser_condition): Use both the above; enforce
	[stmt.stmt]/2 about the declarator not specifying
	a function or an array; improve error-recovery.

/testsuite
2018-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84588
	* g++.dg/cpp0x/cond1.C: New.
	* g++.dg/cpp1y/pr84588-1.C: Likewise.
	* g++.dg/cpp1y/pr84588-2.C: Likewise.
	* g++.dg/cpp1y/pr84588-3.C: Likewise.
	* g++.dg/parse/cond6.C: Likewise.
	* g++.dg/parse/cond7.C: Likewise.
	* g++.dg/parse/cond8.C: Likewise.
	* g++.dg/cpp1z/decomp16.C: Update.
	* g++.old-deja/g++.jason/cond.C: Likewise.

From-SVN: r260482