gistfile1.txt

diff --git a/mono/mini/aot-compiler.c b/mono/mini/aot-compiler.c
index 00aaf45..1bdcc5c 100644
--- a/mono/mini/aot-compiler.c
+++ b/mono/mini/aot-compiler.c
@@ -2735,7 +2735,12 @@ add_wrappers (MonoAotCompile *acfg)
                                MonoType *t;
                                MonoClass *klass;
 
-                               g_assert (method->flags & METHOD_ATTRIBUTE_STATIC);
+                               /* this cannot be enforced by the C# compiler so we must give the user some warning before aborting */
+                               if (!(method->flags & METHOD_ATTRIBUTE_STATIC)) {
+                                       g_warning ("AOT restriction: Method '%s' must be static since it is decorated with [MonoPInvokeCallback]. See http://ios.xamarin.com/Documentation/Limitations#Reverse_Callbacks", 
+                                               mono_method_full_name (method, TRUE));
+                                       exit (1);
+                               }
 
                                g_assert (sig->param_count == 1);
                                g_assert (sig->params [0]->type == MONO_TYPE_CLASS && !strcmp (mono_class_from_mono_type (sig->params [0])->name, "Type"));