allow Cpv type to have a slot

src/atom/parsers.rs

@@ -351,10 +351,12 @@ impl<'a> Parseable<'a, &'a str> for Cpv {
         Category::parser()
             .and(Name::parser().preceded_by(tag("/")))
             .and(Version::parser().preceded_by(tag("-")))
-            .map(|((category, name), version)| Cpv {
+            .and(Slot::parser().preceded_by(tag(":")).opt())
+            .map(|(((category, name), version), slot)| Cpv {
                 category,
                 name,
                 version,
+                slot,
             })
     }
 }
@@ -479,4 +481,11 @@ mod test {
 
         Atom::parser().check_finished(it).unwrap();
     }
+
+    #[test]
+    fn test_cpv_with_slot() {
+        let it = InputIter::new("foo/bar-1.0:slot/sub=");
+
+        Cpv::parser().check_finished(it).unwrap();
+    }
 }