> r7rs-small defines some, for example exact-complex. Maybe I'm just > missing something. It says those are just suggestions: > Here is an example of what features might return: > > (features) => > (r7rs ratios exact-complex full-unicode > gnu-linux little-endian > fantastic-scheme > fantastic-scheme-1.0 > space-ship-control-system) Though it's good that it sets a precedent :)