fix some things

lib/parser/type_parser.js

@@ -8,6 +8,11 @@ import { TYPE_VARS } from "../primitives/typevars.js";
 import { dictType, fnType, lsType, prodType, sumType } from "../structures/type_constructors.js";
 import { setType } from "../structures/type_constructors.js";
 
+// A very stupid little parser, that can only parse:
+//   - primitives               => simply maps onto types.
+//   - things between brackets  => calls a type constructor that takes one parameter on whatever is between the brackets.
+//   - binary (infix) operators => calls a type constructor that takes two parameters on the LHS and RHS.
+
 export const makeTypeParser = ({
   // parser can be extended:
   extraPrimitives=[],
@@ -49,13 +54,6 @@ export const makeTypeParser = ({
     ['⇒', dictType],
     ['=>', dictType],
   
-    // only used for type variables (e.g., ∀a,b,c:)
-    [',', fnX => fnY => {
-      const x = fnX();
-      const y = fnY();
-      return Array.isArray(x) ? x.concat(y) : [x].concat(y)
-    }],
-
     ...extraInfixOperators,
   ]);