changed writer to no-op when feature 'inspect' is disabled

src/main.rs

@@ -134,7 +134,7 @@ async fn normal(cfg: config::Config) -> eyre::Result<()>
 
     //#[cfg(debug_assertions)] cfg_eprintln!(Verbose; cfg, "{:?}", graph);
     
-    use futures::future::OptionFuture;
+    #[allow(unused_imports)] use futures::future::OptionFuture;
     let (graph, writer) = {
 	cfg_if!{
 	    if #[cfg(feature="inspect")] {
@@ -146,7 +146,7 @@ async fn normal(cfg: config::Config) -> eyre::Result<()>
 		};
 		(g, OptionFuture::from(w))
 	    } else {
-		(graph, OptionFuture::from(Option::<futures::future::BoxFuture<'static, ()>>::None))
+		(graph, ())//OptionFuture::from(Option::<futures::future::BoxFuture<'static, ()>>::None))
 	    }
 	}
     };