re PR c++/88986 (ICE: tree check: expected tree that contains 'decl minimal' structure, have 'error_mark' in member_vec_binary_search, at cp/name-lookup.c:1136)

/cp
2019-02-13  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/88986
	* decl.c (make_typename_type): Allow for TYPE_PACK_EXPANSION as
	context (the first argument).
	* pt.c (tsubst, case TYPENAME_TYPE): Handle TYPE_PACK_EXPANSION
	as context.

/testsuite
2019-02-13  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/88986
	* g++.dg/cpp1z/using4.C: New.
	* g++.dg/cpp1z/using5.C: Likewise.
	* g++.dg/cpp1z/using6.C: Likewise.

From-SVN: r268839