make (a < b < c) illegal?

[Henning Hasemann]

Another way to solve this problem might be the following:

- Say Comparsion operators are not defined for booleans
- Instead define a few new operations on booleans such as
  Aequivalence (for example "<->" instead of "==").
  Note for example that xor (is it ^^ in D too?) already has
  the same meaning as != for booleans.

implications whould be:
- new operator symbols may have to be introduced
- this change might break some code, but the compiler
  should spot every line thats affected by the change
- it should lead to a much 'cleaner' grammar, think of
  the reason why its "hello " ~ "world" not "hello " + "world"!

Henning