[PR86379] do not use TREE_TYPE for USING_DECL_SCOPE
It's too risky to reuse the type field for USING_DECL_SCOPE.
Language-independent parts of the compiler, such as location and
non-lvalue wrappers, happily take the TREE_TYPE of a USING_DECL as if
it was a type rather than an unrelated scope.
For better or worse, USING_DECLs use the non-common struct so we can
use the otherwise unused result field. Adjust fallout, from uses of
TREE_TYPE that were supposed to be USING_DECL_SCOPE, to other
accidental uses of TREE_TYPE of a USING_DECL.
for gcc/cp/ChangeLog
PR c++/86379
* cp-tree.h (USING_DECL_SCOPE): Use result rather than type.
* name-lookup.c (strip_using_decl): Use USING_DECL_SCOPE.
* search.c (protected_accessible_p): Follow USING_DECL_DECLS.
(shared_member_p): Likewise.
(lookup_member): Likewise.
* decl.c (grok_special_member_properties): Skip USING_DECLs.
* semantics.c (finish_omp_declare_simd_methods): Likewise.
(finish_qualified_id_expr): Do not call shared_member_p with
a dependent expr.
for gcc/testsuite/ChangeLog
PR c++/86379
* g++.dg/cpp0x/pr86379.C: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@268851
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