From df3c07b0a9a3919ad8d2550f986a04a314741de1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Drwi=C4=99ga?= <tomasz@ethcore.io>
Date: Tue, 29 Nov 2016 17:14:28 +0100
Subject: [PATCH] adding proof to a panicker

---
 dapps/src/lib.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dapps/src/lib.rs b/dapps/src/lib.rs
index b185eb57a..9bb3be4a7 100644
--- a/dapps/src/lib.rs
+++ b/dapps/src/lib.rs
@@ -266,7 +266,11 @@ impl Server {
 	#[cfg(test)]
 	/// Returns address that this server is bound to.
 	pub fn addr(&self) -> &SocketAddr {
-		&self.server.as_ref().expect("server is always Some at the start; it's consumed only when object is dropped; qed").addrs()[0]
+		self.server.as_ref()
+			.expect("server is always Some at the start; it's consumed only when object is dropped; qed")
+			.addrs()
+			.first()
+			.expect("You cannot start the server without binding to at least one address; qed")
 	}
 }