/// copy a file. Return non-empty log on success, empty log on failure.
virtual std::string copy(support::FileName const &, std::string const &) = 0;
/// check in the current revision.
- /// \p log is non-empty on success and may be empty on failure.
+ /// \p log is non-empty on success and may be empty on failure.
virtual LyXVC::CommandResult
checkIn(std::string const & msg, std::string & log) = 0;
/// can this operation be processed in the current VCS?