Log the binding that is duplicated

square · Aug 31, 2016 · 7005d6c · 7005d6c
1 parent a6f598b
commit 7005d6c
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/Cleanse/Graph.swift b/Cleanse/Graph.swift
@@ -109,11 +109,15 @@ class Graph : Binder {
     private func addProvider(provider provider: AnyProvider) {
         /// If Tag is a _VoidTag, then we want to add it as a provider without the tagged type
         let key = RequirementKey(provider.dynamicType)
-
-        precondition(inOverridesMode || providers[key] == nil)
+
+        if !inOverridesMode {
+            if let existingKey = providers[key] {
+                fatalError("Already bound at \(existingKey.instanceProvidesType)")
+            }
+        }
+
         providers[key] = provider
 
-
         if let getterProvider = provider.anyGetterProvider {
             providers[RequirementKey(getterProvider.dynamicType)] = getterProvider
         }