Fix

src/expresses.ts

@@ -4,9 +4,9 @@ import { AbstractTag, Trait, TraitAbstractMembersFn, TraitApplierSuperTag, Trait
 import { ExtendFn, ExtendableFn, SimplifyFn, StaticMembersFn } from "./util"
 
 
-class TraitExpression<
+export class TraitExpression<
     Super  extends AbstractClass<{}>,
-    Traits extends Trait<any, any>[],
+    Traits extends Trait<any, any, any>[],
 > {
     constructor(
         readonly superclass:  Super,

src/trait.ts

@@ -1,6 +1,6 @@
 import { Fn } from "hotscript"
 import { AbstractClass, Class, Opaque } from "type-fest"
-import { AbstractTag } from "."
+import { AbstractTag, TraitExpression } from "."
 import { StaticMembers } from "./util"
 
 
@@ -28,21 +28,21 @@ type RemoveAbstractFromImpl<
 
 
 export class Trait<
+    Super     extends TraitExpression<any, any>[],
     Abstract  extends {},
     Impl      extends Class<{}, []>,
-    Supertraits extends Trait<any, any, any>[]
 > {
     constructor(
-        readonly supertraits:  Supertraits,
+        readonly supertraits:  Super,
         readonly ownAbstract:  Abstract,
         readonly apply:        (Super: AbstractClass<{}>) => Impl,
     ) {}
 }
 
 export interface Trait<
+    Super       extends TraitExpression<any, any>[],
     Abstract    extends {},
     Impl        extends Class<{}, []>,
-    Supertraits extends Trait<any, any, any>[]
 > {
     get ownImplClass(): Impl
 }