-PreSequence = ps:: Elements
- | PreSequence !wp ^"/" !ws e
- | PreSequence ^"->" e /ws
- | (Quoted|word) ^"::" PreSequence /ws
- | PreSequence ^"=>" ("[]"|"()"|word|Quoted) /ws
+PreSequence = PS
+ | (Quoted|Word) ^"::" PreSequence /ws
+ > PreSequence ^"/" e /ws
+ | PreSequence ^"->" e /ws
+PS = Elements
+