On 02/08/2012 16:58, Joel C. Salomon wrote:
>     "\some_function_with_a_very_long_name:nnnnn" <first argument>
> <second argument> <third argument> <fourth argument> <fifth argument>

Not related to the issue, but in general we've favoured

  \cs{some_function} \Arg{with an argument}

(Looking long-term, I think this might be better to avoid active
characters, while \cs... offers more possibilities than just 'verbatim'
when consdiering format conversions.)
-- 
Joseph Wright