>>We already know that it is non-trivial to port much
>>non-Plan9 code to Plan9-native and vice versa.

i have found porting well written Unix
code to native plan 9 (libc.h, 8[cl] etc)
to be straightforward.  the main exceptions
are socket calls but since those involve deleting
lots of ugly lines of code, it's satisfying, and since
they mainly involve call setup with the I/O the
same read/write after that, it's not too hard.
the compilers sometimes pick up
old problems that were lurking though.