From ee008e1e8196b1a29da9341fbb6e28a7177cda04 Mon Sep 17 00:00:00 2001
From: Brandon Williams <135203+mbrandonw@users.noreply.github.com>
Date: Fri, 17 Oct 2025 14:07:24 -0500
Subject: [PATCH] Fix warnings from existential and deprecation (#3800)

* Use explicit 'any' for existential.

* Fix deprecation warning.
---
 Sources/ComposableArchitecture/Effect.swift | 2 +-
 Sources/ComposableArchitecture/Macros.swift | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Sources/ComposableArchitecture/Effect.swift b/Sources/ComposableArchitecture/Effect.swift
index bfd4c734f23b..b71f9e56b410 100644
--- a/Sources/ComposableArchitecture/Effect.swift
+++ b/Sources/ComposableArchitecture/Effect.swift
@@ -423,7 +423,7 @@ extension Effect {
       name: String?,
       priority: TaskPriority? = nil,
       operation: @escaping @Sendable () async throws -> Success
-    ) where Failure == Error {
+    ) where Failure == any Error {
       self.init(priority: priority, operation: operation)
     }
   }
diff --git a/Sources/ComposableArchitecture/Macros.swift b/Sources/ComposableArchitecture/Macros.swift
index 036387628e4c..dfa01b5f4f19 100644
--- a/Sources/ComposableArchitecture/Macros.swift
+++ b/Sources/ComposableArchitecture/Macros.swift
@@ -56,6 +56,7 @@ public macro Reducer(state: _SynthesizedConformance..., action: _SynthesizedConf
 #endif
 public struct _SynthesizedConformance: Sendable {}
 
+@available(*, deprecated, message: "Define your conformance using an extension, instead")
 extension _SynthesizedConformance {
   /// Extends the `State` or `Action` types that ``Reducer()`` creates with the `Codable`
   /// protocol.