If the conference is double blind, how could you even tell? Also, there are plenty of single author papers in compilers and PL that are considered seminal, actually most seminal papers are single author. Multi-author papers are typically student ones.
Another point here: in CS, there appears to be little to no difference between "conference paper" and "journal paper".
That is _not_ always the case. In the biosciences, "conference paper" means "an undergrad could do this half-asleep, and probably did; nobody actually cares much."
