Here when we want to synthesize methods for foo()::B maybe_push_to_top_level
calls push_function_context, which sets cfun to a dummy value; later
finish_call_expr tries to set something in
cp_function_chain (i.e. cfun->language), which isn't set. Many places in
the compiler check cfun && cp_function_chain to avoid this problem; here we
also want to check !cp_unevaluated_operand, like set_flags_from_callee does.
PR c++/115561
gcc/cp/ChangeLog:
* semantics.cc (finish_call_expr): Check cp_unevaluated_operand.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-lambda21.C: New test.
(cherry picked from commit 3129a2ed6a764c0687efaca9eba53dcf12d1d8a0)
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