add test for fsharp/fsharp#483

Author: dsyme

tests/fsharp/core/fsiAndModifiers/test.fsx

@@ -86,6 +86,18 @@ module TestPack4 =
     printfn "got %A" got
     if got <> expected then fail (sprintf "TestPack4: got %A, expected %A" got expected)
 
+// See https://github.com/fsharp/fsharp/issues/483
+module TestFsiLoadOfNonExistentAssembly = 
+    let test() = 
+      try 
+        let log4netType = System.Type.GetType("ThisTypeDoes.Not.Exist, thisAssemblyDoesNotExist")
+        let exists = log4netType <> null
+        if exists then fail (sprintf "type existed!")
+        do printfn "%A" exists
+       with e -> 
+         fail (sprintf "exception unexpected: %s" e.Message)
+
+    do test()
 
 if errors.IsEmpty then 
     System.IO.File.WriteAllText("test.ok", "")