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This adds another case to static_assert to print a helpful diagnostic when comparing reflections. This makes it easier to see what's gone wrong when doing 'static_assert(some_query(^^a) == some_query(^^b));' by decomposing the resulting resulting reflection. gcc/cp/ChangeLog: * constexpr.cc (diagnose_failing_condition): Also decompose comparisons of reflections. gcc/testsuite/ChangeLog: * g++.dg/reflect/diag5.C: New test. Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com> Reviewed-by: Marek Polacek <polacek@redhat.com> Reviewed-by: Jason Merrill <jason@redhat.com>
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