verify that repo names are also valid package names

src/atom/parsers.rs

@@ -247,6 +247,11 @@ impl<'a> Parseable<'a, &'a str> for Repo {
         start
             .and(rest)
             .recognize()
+            .verify_output(move |output: &&str| {
+                Name::parser()
+                    .check_finished(InputIter::new(*output))
+                    .is_ok()
+            })
             .map(|output: &str| Repo(output.to_string()))
     }
 }