Use or abuse of laissezVibrer

[Johan Vromans]

Given

\relative c' {
  r2 r4 r8 c8 ~ |
  \repeat volta 2 {
    c4 c c c |
  }
  \alternative {
    { r2 r4 r8 c8 ~ | }
    { c4 c c c | }
  }
}

The last note of the first alternative should have a tie, but it should
not be tied to the next note. If the next note were not a 'c', an error
message would have been emitted.

Visually, this gives the correct output:

  \alternative {
    { r2 r4 f8 c8 \laissezVibrer }
    { c8 c c c }
  }

But is this the correct way? For example, in the midi the note doesn't
sound tied.

-- Johan