[Haskell-cafe] alphanum in infix constructors (and possibly functions as well) - why not?

Hi all, The constructor names in Haskell need to obey one of the two following rules: - either starts with a capital letter and contains alphanumeric characters afterwards, (including _ I guess) - or starts with a colon (:) and only contains symbols afterwards The first one is used Prefix by default, and the second ose is used infix by default. What stops us from allowing alphanum characters appear in the Infix version (after the colon)? Can't it be relaxed to only start woth a colon? So I want to be able to say something like: data Expr = Expr :< Expr -- checks for LT betwen two Expr's | Expr :<2 Expr -- a different implementation of the same thing maybe | Expr :