public async Task <(ImmutableArray <Update>, ImmutableArray <Diagnostic>)> EmitSolutionUpdateAsync(Solution solution, CancellationToken cancellationToken)
{
Task task = _delegates.Item3(_hotReloadService, solution, cancellationToken);
await task.ConfigureAwait(false);
var log = _delegates.Item5();
return(_delegates.Item4(task));
}