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The following testcase ICEs in C++ 20 and older, because during diagnostics dump_template_bindings attempts to tsubst with tf_none something and we try to emit a pedwarn during that. While the pedwarn could be just guarded with if (complain & tf_warning), I thought we shouldn't support extensions for tf_none and should instead return error_mark_node. The following patch does that. 2026-02-17 Jakub Jelinek <jakub@redhat.com> PR c++/120685 * typeck2.cc (build_functional_cast_1): For C++23 auto(x) without tf_warning or tf_error return error_mark_node instead of emitting pedwarn and handling it. * semantics.cc (finish_compound_literal): Similarly for C++26 auto{x}. * g++.dg/cpp23/auto-fncast19.C: New test.
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