NamespaceSymbolsMatchAsync( arg.solution, arg.namespace1,
(namespace2Count > 1 && await namespace2.ConstituentNamespaces.AnyAsync(static (n2, arg) => NamespaceSymbolsMatchAsync(arg.solution, arg.namespace1, n2, arg.cancellationToken), (solution, namespace1, cancellationToken)).ConfigureAwait(false)))
NamespaceSymbolsMatchAsync( arg.solution, n, arg.namespace2, arg.cancellationToken