added test file for issue #579 (not yet linked into test suite)
added test file for issue #579 (not yet linked into test suite)

nikhilsinghmus/csound,nikhilsinghmus/csound,Angeldude/csound,Angeldude/csound,nikhilsinghmus/csound,Angeldude/csound,nikhilsinghmus/csound,Angeldude/csound,Angeldude/csound,nikhilsinghmus/csound,Angeldude/csound,Angeldude/csound,nikhilsinghmus/csound,nikhilsinghmus/csound,Angeldude/csound,nikhilsinghmus/csound,nikhilsinghmus/csound,nikhilsinghmus/csound,Angeldude/csound,Angeldude/csound