progress and some refactoring

stdlib.js

@@ -1,8 +1,11 @@
+import { ModuleSymbol } from "./lib/symbol.js";
+import { ModuleTypeConstructor } from "./lib/type_constructor.js";
 import { ModuleBool } from "./primitives/bool.js";
 import { ModuleByte } from "./primitives/byte.js";
 import { ModuleChar } from "./primitives/char.js";
 import { ModuleDouble } from "./primitives/double.js";
 import { ModuleInt } from "./primitives/int.js";
+import { ModuleUnit } from "./primitives/unit.js";
 import { ModuleFunction } from "./structures/function.js";
 import { ModuleList } from "./structures/list.js";
 import { ModuleProduct } from "./structures/product.js";
@@ -14,12 +17,16 @@ export const ModuleStd = {l:[
   ...ModuleType.l,
   ...ModuleTyped.l,
 
+  ...ModuleTypeConstructor.l,
+
   // Primitive types
   ...ModuleBool.l,
   ...ModuleByte.l,
   ...ModuleChar.l,
   ...ModuleDouble.l,
   ...ModuleInt.l,
+  ...ModuleSymbol.l,
+  ...ModuleUnit.l,
 
   // Types that consist of other types
   ...ModuleFunction.l,