From 52f2f96f36413e51875ac85a5c5e0768fd439082 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 22 Jun 2018 01:01:45 +0100
Subject: [PATCH] Closed beta 1.3.7.1: Fix Release build.

---
 Telegram/SourceFiles/base/unique_function.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/base/unique_function.h b/Telegram/SourceFiles/base/unique_function.h
index 46c686726..48c4cbfc2 100644
--- a/Telegram/SourceFiles/base/unique_function.h
+++ b/Telegram/SourceFiles/base/unique_function.h
@@ -124,7 +124,10 @@ public:
 		_impl.swap(other._impl);
 	}
 
-	template <typename ...OtherArgs>
+	template <
+		typename ...OtherArgs,
+		typename = decltype(std::declval<std::function<Return(Args...)>>()(
+			std::declval<OtherArgs>()...))>
 	Return operator()(OtherArgs &&...args) {
 		return _impl(std::forward<OtherArgs>(args)...);
 	}