Footnote problem with \default

[Nick Payne]

The footnote documentation in the NR 3.2.3 says that one can use 
\default at the end of a footnote command to attach the footnote to a 
moment of time rather than a particular item. If I do this, then the 
console shows a lot of identical programming error and warning messages, 
and the footnote appears multiple times in the output. Remove the 
\default at the end of the footnote command and everything works fine.

%========================
\version "2.15.40"

\paper {
    #(set-paper-size "a6")
}

\relative c'' {
    \footnote #'(-1.5 . 1.5) \markup { Footnote } \default
    c c c c
}
%========================

test.png
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