From 6be4b133465f12c69420b5c0b334da4f1149f969 Mon Sep 17 00:00:00 2001
From: Wayne Meissner <wmeissner@gmail.com>
Date: Tue, 13 Nov 2012 07:43:01 +1100
Subject: Fix FFI.attach_function to not rewrite the passed in arg_types array
 in-place

---
 lib/ffi/library.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ffi/library.rb b/lib/ffi/library.rb
index 3aa781f..20edab1 100644
--- a/lib/ffi/library.rb
+++ b/lib/ffi/library.rb
@@ -212,7 +212,7 @@ module FFI
       cname, arg_types, ret_type, opts = (a4 && (a2.is_a?(String) || a2.is_a?(Symbol))) ? [ a2, a3, a4, a5 ] : [ mname.to_s, a2, a3, a4 ]
 
       # Convert :foo to the native type
-      arg_types.map! { |e| find_type(e) }
+      arg_types = arg_types.map { |e| find_type(e) }
       options = {
         :convention => ffi_convention,
         :type_map => defined?(@ffi_typedefs) ? @ffi_typedefs : nil,
-- 
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