Subtrait work

src/tests.ts

@@ -1,5 +1,7 @@
-import { Call } from "hotscript"
-import { Implements, TraitExpressionTraitsFn, abstract, expression, trait } from "."
+import { Call, ComposeLeft, Pipe } from "hotscript"
+import { Implements, TraitExpressionAbstractFn, TraitExpressionTraitsFn, abstract, expression, trait } from "."
+import { Simplify } from "type-fest"
+import { SimplifyFn } from "./util"
 
 
 const PrintsHelloOnNew = trait(
@@ -59,9 +61,23 @@ const builder = expression
     )
 
 const exp = builder.get()
-type Abs = Call<TraitExpressionTraitsFn, typeof exp>
+type Abs = Call<ComposeLeft<[
+    TraitExpressionAbstractFn,
+    SimplifyFn,
+]>, typeof exp>
+
+exp.subtrait(
+    s => {
+        interface Subtrait extends (typeof s) {
+
+        }
+
+        return abstract<Subtrait>()
+    },
+)
 
 class User extends exp.extends implements Implements<typeof exp> {
+    declare status: { _tag: "awaitingPayment" } | { _tag: "active"; activeSince: Date; expiresAt?: Date | undefined } | { _tag: "expired"; expiredSince: Date }
     id: bigint = -1n
 }