>> > Maybe in the Unix port of kencc they'll be wanted. >> >> one problem. kenc runs on plan 9. plan 9 supports unicode. > > http://code.google.com/soc/p9/appinfo.html?csaid=79263BFBBBDEAE1B
the compilers already run on unix (and windows) and because their input language handles utf-8 values and escapes in strings, the c99 construction has not been needed (or i'd have added it). it might be needed for some unix programs (but there are so many other things those expect that it's probably the least of your worries)
