snoyberg/classy-prelude — pull request #24 by nikita-volkov (2013-01-29 13:22:00+00:00)
Title: notMember

I myself am really not sure about this one, since the effect of this function is easily achievable using the general `not` function, but on the other hand `notMember` is exported by all standard modules, which export `member`.

This could be a question of philosophy behind the library and which conventions we set with it.