Debug downloading

src/cargo/core/package.rs

@@ -658,6 +658,7 @@ impl<'a, 'cfg> Downloads<'a, 'cfg> {
     /// eventually be returned from `wait_for_download`. Returns `Some(pkg)` if
     /// the package is ready and doesn't need to be downloaded.
     pub fn start(&mut self, id: PackageId) -> CargoResult<Option<&'a Package>> {
+        println!("start download: {}", id);
         self.start_inner(id)
             .with_context(|| format!("failed to download `{}`", id))
     }
@@ -784,14 +785,15 @@ impl<'a, 'cfg> Downloads<'a, 'cfg> {
             token,
             data: RefCell::new(Vec::new()),
             id,
-            url,
+            url: url.clone(),
             descriptor,
             total: Cell::new(0),
             current: Cell::new(0),
             start: Instant::now(),
             timed_out: Cell::new(None),
             retry: Retry::new(self.set.config)?,
         };
+        println!("Downloading {} from {}", id, url);
         self.enqueue(dl, handle)?;
         self.tick(WhyTick::DownloadStarted)?;