Merge branch 'maint-0.3.4'

  o Minor bugfixes (rust):

    - Protover parsing was accepting the presence of whitespace in version

      strings, which the C implementation would choke on, e.g. "Desc=1\t,2".

      Fixes bug 27177; bugfix on 0.3.3.5-rc.

    /// ```

    fn from_str(version_string: &str) -> Result<Self, Self::Err> {

        let mut pairs: Vec<(Version, Version)> = Vec::new();

        let pieces: ::std::str::Split<char> = version_string.trim().split(',');

        for piece in pieces {

            let p: &str = piece.trim();

        let pieces: ::std::str::Split<char> = version_string.split(',');

        for p in pieces {

            if p.is_empty() {

                continue;

            } else if p.contains('-') {

                pairs.push((v, v));

            }

        }

        // If we were passed in an empty string, or a bunch of whitespace, or

        // If we were passed in an empty string, or

        // simply a comma, or a pile of commas, then return an empty ProtoSet.

        if pairs.len() == 0 {

            return Ok(ProtoSet::default());

        assert_eq!(Err(ProtoverError::Unparseable), ProtoSet::from_str("%="));

    }

    #[test]

    fn test_versions_from_str_whitespace() {

        assert_eq!(Err(ProtoverError::Unparseable), ProtoSet::from_str("1,2\n"));

        assert_eq!(Err(ProtoverError::Unparseable), ProtoSet::from_str("1\r,2"));

        assert_eq!(Err(ProtoverError::Unparseable), ProtoSet::from_str("1,\t2"));

    }

    #[test]

    fn test_versions_from_str_overlap() {

        assert_eq!(Err(ProtoverError::Overlap), ProtoSet::from_str("1-3,2-4"));