https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114388
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This changed with r9-595-g955da5e5443724:
CWG 616, 1213 - value category of subobject references.
* tree.c (lvalue_kind): A reference to a subobject of a prvalue is
an xvalue.
* typeck2.c (build_m_component_ref): Likewise.
* typeck.c (cp_build_addr_expr_1, lvalue_or_else): Remove
diagnostic
distinction between temporary and xvalue.
From-SVN: r260621
CWG 616 and CWG 1213 are DR, so apply to C++98.
I don't think GCC cares about N3055 here.
