From f8a6044dba1ac89082a82c1bdd62346e4602b5c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6nke=20Ludwig?= <sludwig@outerproduct.org>
Date: Fri, 18 Dec 2020 14:11:29 +0100
Subject: [PATCH] Avoid modern contract syntax.

---
 source/vibe/core/sync.d | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/source/vibe/core/sync.d b/source/vibe/core/sync.d
index 9f29d4b..a636ace 100644
--- a/source/vibe/core/sync.d
+++ b/source/vibe/core/sync.d
@@ -132,7 +132,7 @@ struct ScopedMutexLock(M)
 	@property bool locked() const { return m_locked; }
 
 	void unlock()
-	in (this.locked)
+	in { assert(this.locked); }
 	do {
 		enforce(m_locked);
 		m_mutex.unlock();
@@ -140,13 +140,13 @@ struct ScopedMutexLock(M)
 	}
 
 	bool tryLock()
-	in (!this.locked)
+	in { assert(!this.locked); }
 	do {
 		return m_locked = m_mutex.tryLock();
 	}
 
 	void lock()
-	in (!this.locked)
+	in { assert(!this.locked); }
 	do {
 		m_locked = true;
 		m_mutex.lock();