Make "is" totally equivalent to ":" (in function declaration), make ("," equivalent to "&")

The : means that the type on the left is a subclass from the type on the right. E.g. in type declarations (a:Eq), category decls: cat Map k v : Set k.

For multiple subclassing, both "&" and "," should be possible: (a:Eq & Ord), (a:Eq, Ord); cat Map k v : Set k, List b, cat X a b: Monad a & List b

[x] Functions: declaration, lawDeclaration (do not touch law!)
[x] Typedefs: optNamed, named, subclass
[x] Types: reqSep (reuse this rule with a different name). ReqSep is the rule denoting "is subtype"
[x] Types: add "disjunction" token, which can be , or &. Also see #54

pietervdvn / Lang

Make "is" totally equivalent to ":" (in function declaration), make ("," equivalent to "&") #49