Parser stalls on some bad inputs.

[AHartNtkn]

For whatever reason, the Caledon program will stall, eating up an arbitrarily large amount of memory when encountering certain code which should instead produce syntax errors. Here are some examples of code which, if encountered, will trigger what I'm talking about;

defn unit : prop
  as

defn unit : prop
  as \(P : prop) P . P

defn unit : prop
  as [P : prop] P -> P

defn tt : unit
  as \0 p . p

defn unit : prop
  | tt = 

defn unit : prop
  | tt = \(P : prop) . unit

defn unit : prop
   | one  = unit

a(