From 86f41ae0a483a8c584e0596082cf1a70d5996e0a Mon Sep 17 00:00:00 2001
From: Carter Anderson <mcanders1@gmail.com>
Date: Sat, 11 Jul 2020 20:12:34 -0700
Subject: [PATCH] add more informative "resource does not exist" errors

---
 crates/bevy_ecs/src/resources.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crates/bevy_ecs/src/resources.rs b/crates/bevy_ecs/src/resources.rs
index 41101cd244..e1b69f1c69 100644
--- a/crates/bevy_ecs/src/resources.rs
+++ b/crates/bevy_ecs/src/resources.rs
@@ -140,7 +140,7 @@ impl Resources {
         let archetype = self
             .resource_archetypes
             .get(&TypeId::of::<T>())
-            .expect("Resource does not exist");
+            .unwrap_or_else(|| panic!("Resource does not exist {}", std::any::type_name::<T>()));
         Res::new(archetype, 0).expect("Resource does not exist")
     }
 
@@ -149,7 +149,7 @@ impl Resources {
         let archetype = self
             .resource_archetypes
             .get(&TypeId::of::<T>())
-            .expect("Resource does not exist");
+            .unwrap_or_else(|| panic!("Resource does not exist {}", std::any::type_name::<T>()));
         ResMut::new(archetype, 0).expect("Resource does not exist")
     }
 }