diff --git a/src/Cause.ts b/src/Cause.ts
index af61117..54012a1 100644
--- a/src/Cause.ts
+++ b/src/Cause.ts
@@ -3,17 +3,17 @@ import * as $Type from './Type'
 import { Variant } from './Type'
 import { FiberId } from './fiber/FiberId'
 
-export type Cause<E> = Fail<E> | Die | Interrupt
+export type Cause<E> = Die | Fail<E> | Interrupt
 
 type _Cause<T extends string> = Variant<typeof uri, T>
 
-export interface Fail<E> extends _Cause<'Fail'> {
-  readonly error: E
+export interface Die extends _Cause<'Die'> {
+  readonly error: unknown
   readonly fiberId: FiberId
 }
 
-export interface Die extends _Cause<'Die'> {
-  readonly error: unknown
+export interface Fail<E> extends _Cause<'Fail'> {
+  readonly error: E
   readonly fiberId: FiberId
 }
 
@@ -24,14 +24,14 @@ export interface Interrupt extends _Cause<'Interrupt'> {
 const uri = Symbol('Cause')
 const _cause = $Type.variant(uri)
 
-export function fail<E>(error: E, fiberId: FiberId): Cause<E> {
-  return { ..._cause('Fail'), error, fiberId }
-}
-
 export function die(error: unknown, fiberId: FiberId): Cause<never> {
   return { ..._cause('Die'), error, fiberId }
 }
 
+export function fail<E>(error: E, fiberId: FiberId): Cause<E> {
+  return { ..._cause('Fail'), error, fiberId }
+}
+
 export function interrupt(fiberId: FiberId): Cause<never> {
   return { ..._cause('Interrupt'), fiberId }
 }
@@ -40,14 +40,14 @@ export function is(u: unknown): u is Cause<unknown> {
   return $Struct.is(u) && $Struct.has(u, $Type.uri) && u[$Type.uri] === uri
 }
 
-export function isFail<E>(cause: Cause<E>): cause is Fail<E> {
-  return cause[$Type.tag] === 'Fail'
-}
-
 export function isDie(cause: Cause<any>): cause is Die {
   return cause[$Type.tag] === 'Die'
 }
 
+export function isFail<E>(cause: Cause<E>): cause is Fail<E> {
+  return cause[$Type.tag] === 'Fail'
+}
+
 export function isInterrupt(cause: Cause<any>): cause is Interrupt {
   return cause[$Type.tag] === 'Interrupt'
 }