From 1d01779b2e58f898689e84ce20a9c9ae183a14fe Mon Sep 17 00:00:00 2001
From: Austin Wise <AustinWise@gmail.com>
Date: Thu, 5 Dec 2019 18:58:09 -0800
Subject: [PATCH] Root bindings so the delegate in FunctionBinding is not GCed.

---
 crates/misc/dotnet/src/Instance.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/crates/misc/dotnet/src/Instance.cs b/crates/misc/dotnet/src/Instance.cs
index c145d2be83..86f0b3f825 100644
--- a/crates/misc/dotnet/src/Instance.cs
+++ b/crates/misc/dotnet/src/Instance.cs
@@ -17,8 +17,10 @@ namespace Wasmtime
             Host = host;
             Module = module;
 
-            var bindings = host.GetImportBindings(module);
-            var handles = bindings.Select(b => b.Bind(module.Store, host)).ToList();
+            //Save the bindings to root the objects.
+            //Otherwise the GC may collect the delegates from ExternFunction for example.
+            _bindings = host.GetImportBindings(module);
+            var handles = _bindings.Select(b => b.Bind(module.Store, host)).ToList();
 
             unsafe
             {
@@ -141,5 +143,6 @@ namespace Wasmtime
         private Interop.wasm_extern_vec_t _externs;
         private Dictionary<string, ExternFunction> _functions;
         private Dictionary<string, ExternGlobal> _globals;
+        private List<Bindings.Binding> _bindings;
     }
 }