take at least 1 version suffix to prevent allowing versions such as 1.0_

src/atom/parsers.rs

@@ -87,7 +87,7 @@ impl<'a> Parseable<'a, &'a str> for VersionSuffixes {
     fn parser() -> Self::Parser {
         VersionSuffix::parser()
             .separated_by(tag("_"))
-            .many()
+            .at_least(1)
             .map(|suffixes| VersionSuffixes(suffixes))
     }
 }
@@ -486,4 +486,11 @@ mod test {
 
         Cpv::parser().check_finished(it).unwrap();
     }
+
+    #[test]
+    fn test_cpv_without_version_but_trailing_almost_version() {
+        let it = InputIter::new("dev-perl/mod-p-2.3_");
+
+        assert!(Cpv::parser().parse_finished(it).is_err());
+    }
 }