From 508b724dd7aed2bfce9d0b584e98a4479e7a03d7 Mon Sep 17 00:00:00 2001
From: Dzmitry Malyshau <kvarkus@gmail.com>
Date: Mon, 18 Mar 2019 11:00:43 -0400
Subject: [PATCH] Helpful error message on empty backend

---
 wgpu-native/src/instance.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/wgpu-native/src/instance.rs b/wgpu-native/src/instance.rs
index c479881278..fcbe5e6b94 100644
--- a/wgpu-native/src/instance.rs
+++ b/wgpu-native/src/instance.rs
@@ -149,7 +149,9 @@ pub fn instance_get_adapter(instance_id: InstanceId, desc: &AdapterDescriptor) -
         PowerPreference::LowPower => low.or(high),
         PowerPreference::HighPerformance | PowerPreference::Default => high.or(low),
     };
-    some.or(other).unwrap()
+    some
+        .or(other)
+        .expect("No adapters found. Please enable the feature for one of the graphics backends: vulkan, metal, dx12, dx11")
 }
 
 #[cfg(feature = "local")]