From 50a580ded8a61a141409fef9d5be78945a748bf3 Mon Sep 17 00:00:00 2001
From: Thomas Wilde <thomas.wilde@dudagroup.com>
Date: Wed, 10 Jan 2018 17:30:30 +0100
Subject: [PATCH] fix bug: copy input value before pushing it to the stack in
 arg()

---
 kvm/execute.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kvm/execute.go b/kvm/execute.go
index d609a97..6ad028a 100644
--- a/kvm/execute.go
+++ b/kvm/execute.go
@@ -83,7 +83,7 @@ func (vm VirtualMachine) Execute(program inst.Sequence, input val.Value) (val.Va
 					nil,
 				}
 			}
-			stack.Push(input)
+			stack.Push(input.Copy())
 
 		case inst.CurrentUser:
 			stack.Push(val.Ref{vm.UserModelId(), vm.UserID})