page-count and "programming error: number of pages is out of bounds"

[Nick Payne]

I have a score which with default settings fits very loosely on three 
pages. By adding page-count = 2 to the paper block it fits without any 
problem on two pages but the log then contains "programming error: 
number of pages is out of bounds".

With 2.13.45, this minimal example reproduces the error in the log. This 
example also gets "warning: couldn't fit music on page" in the log, 
which doesn't happen with the actual score, where I only see the first 
error:

\version "2.13.45"

\relative c'' {
    \repeat unfold 220 {
        c4 c8 c c16 c c c
    }
}

\paper {
    page-count = 3
    ragged-bottom = ##f
    ragged-last-bottom = ##f
    ragged-last = ##f

}