From 8b6b3b0231e36e9174c849b540822365adfdbce1 Mon Sep 17 00:00:00 2001
From: Hiroshi Kimura <muukii.app@gmail.com>
Date: Thu, 22 Aug 2024 15:44:51 +0900
Subject: [PATCH] Update modify operator (#4)

---
 Sources/Wrap/Wrap.swift | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Sources/Wrap/Wrap.swift b/Sources/Wrap/Wrap.swift
index 42a1e35..842c0f9 100644
--- a/Sources/Wrap/Wrap.swift
+++ b/Sources/Wrap/Wrap.swift
@@ -12,7 +12,7 @@ public func <& <T>(argument: inout T, modifier: (inout T) throws -> Void) rethro
 
 public struct _FlowDownBox<Value>: ~Copyable {
 
-  public let value: Value
+  public var value: Value
 
   public init(_ value: consuming Value) {
     self.value = consume value
@@ -44,9 +44,8 @@ extension _FlowDownBox {
   }
 
   public consuming func modify(_ modifier: (inout Value) throws -> Void) rethrows -> Value {
-    var v = value
-    try modifier(&v)
-    return v
+    try modifier(&value)
+    return value
   }
 
   public consuming func filter(_ filter: (consuming Value) -> Bool) -> Value? {