Automated processing of multiple books

[Simon Albrecht]

Hello,

I have written a Scheme function to automatically produce all parts 
given through a symbol-list. Here is a boiled-down, dummy example:
%%%%%%%%%%%%
\version "2.19.28"
printParts =
#(define-scheme-function (abbrs) (symbol-list-or-symbol?)
   (let ((abbrs (if (symbol? abbrs) (list abbrs) abbrs))
         (process-part (lambda (abbr)
                         (print-book-with-defaults
                          #{
                            \book {
                              \bookOutputName #(string-append 
"wrap-multiple-books-"
                                                 (symbol->string abbr))
                              \score { c }
                              \paper { #(set-paper-size "a10") indent = 0 }
                              \header { tagline = ##f }
                            }
                          #}))))
     (map process-part abbrs)))
\printParts one.two
%%%%%%%%%%%%

This compiles fine inasmuch as the output is just as intended, but it 
does sport a:

<0>"/home/simon/lilypond/tests/wrap-multiple-books.ly:17:1: error: bad 
expression type

\printParts one.two"

Is this worth a bug report about this error appearing too easily?

Yours, Simon