[NTG-context] \starbuffer in own macros

Hi all, now that \inline[ref] etc. work—whereas in the case of \someline[ref] \inline[ref] always jumps to the else-branch of its definition and outputs the same line twice—I tried, obviously naive, to realize the following functionality (attachment). It seems that the (wrong?) use of \starbuffer in a macro is the cause of the error: ! File ended while scanning use of \dododowithbuffer. Can someone provide a correction? Regards Andreas