\version "2.18"
%\version "2.19.47"

\score {
  \new Staff {
    <<
      {
        \voiceOne
        a'1 a'
      }
      \new Voice {
        \voiceTwo
        % Removing the articulation will make the file compile
        fis'1 ~ ->
        % Uncommenting the following makes the file compile
        %fis'
        % Uncommenting the following makes the file compile
        % and complain about the unfinished tie
        %g'
      }
    >>
  }
}