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For the https://gcc.gnu.org/pipermail/gcc/2025-November/246977.html issues I've filed https://github.com/cplusplus/CWG/issues/805 which resulted in two CWG issues, https://cplusplus.github.io/CWG/issues/3131.html and https://cplusplus.github.io/CWG/issues/3140.html This patch implements the former, changing the iterating expansion statement http://eel.is/c++draft/stmt.expand#5.2 line from constexpr auto&& range = expansion-initializer; to constexpr decltype(auto) range = (expansion-initializer); (for our partly pre-CWG3044 implementation with static before it). 2026-01-29 Jakub Jelinek <jakub@redhat.com> * cp-tree.h (build_range_temp): Implement CWG3131 - Value categories and types for the range in iterable expansion statements. Add bool argument defaulted to false. * parser.cc (build_range_temp): Add expansion_stmt_p argument, if true build const decltype(auto) __for_range = range_expr instead of auto &&__for_range = range_expr. (cp_build_range_for_decls): For expansion stmts build __for_range as static constexpr decltype(auto) __for_range = (range_expr); rather than static constexpr auto &&__for_range = range_expr;. * g++.dg/cpp26/expansion-stmt1.C (N::begin, N::end, O::begin, O::end): Change argument type from B & to const B & or from D & to const D &. * g++.dg/cpp26/expansion-stmt2.C (N::begin, N::end, O::begin, O::end): Likewise. * g++.dg/cpp26/expansion-stmt3.C (N::begin, N::end, O::begin, O::end): Likewise. * g++.dg/cpp26/expansion-stmt16.C: Expect different diagnostics for C++11. * g++.dg/cpp26/expansion-stmt18.C (N::begin, N::end): Change argument type from B & to const B &. * g++.dg/cpp26/expansion-stmt25.C (N::begin, N::end): Likewise. * g++.dg/cpp26/expansion-stmt26.C: New test. * g++.dg/reflect/p3491-2.C (baz): Move workaround to a new function garply, use the previously #if 0 guarded implementation. (garply): New function.
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