alternatives and partial measures

[D Josiah Boothby]

Using the autopackage 2.7.6, in a Debian environment.

I'm trying to create alternative repeats that start and end inside of 
measures, such as:

\version "2.7.6"

\score{
 \relative c'' {
   \repeat volta 2 {
     \time 6/8
     \partial 8
     c8
     c4. c4.
   }
   \alternative {
     { c4. c4 }
     { c4. c4 }
   }
   \bar "||"
   c8
   c2.
 }
}

Unfortunately, as mentioned in the bugs section at the bottom of the 
documentation page, "Timing information is not remembered at the start 
of an alternative, so after a repeat timing information must be reset by 
hand, for example by setting |Score.measurePosition| or entering 
|\partial|. Similarly, slurs or ties are also not repeated."

When trying to set Score.measurePosition, I tried with a syntax like this:

\set Score.measurePosition = #0

but received an error message: "type check for `measurePosition' failed; 
value `0' must be of type `moment'[5]"

Looking through the lilypond-internals page, I was not able to figure 
out how to set the Score.measurePosition.