Tree: add missing phantom fields

gcanti · May 24, 2018 · 7f92b8d · 7f92b8d
1 parent 6b6a355
commit 7f92b8d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/Tree.ts b/src/Tree.ts
@@ -33,6 +33,8 @@ export type Forest<A> = Array<Tree<A>>
  * @since 1.6.0
  */
 export class Tree<A> {
+  readonly _A!: A
+  readonly _URI!: URI
   constructor(readonly value: A, readonly forest: Forest<A>) {}
   /**
    * @since 1.6.0