From 77d59217a38e2982fdcf6bff800f1c9acc0d9aaf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adolfo=20Ochagav=C3=ADa?= <aochagavia92@gmail.com>
Date: Fri, 16 Jan 2015 22:59:41 +0100
Subject: [PATCH] Add MultiItemDecorator

---
 src/libsyntax/ext/base.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index 666e69c20595..edd66b502862 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -150,6 +150,29 @@ impl Annotatable {
     }
 }
 
+// A more flexible ItemDecorator.
+pub trait MultiItemDecorator {
+    fn expand(&self,
+              ecx: &mut ExtCtxt,
+              sp: Span,
+              meta_item: &ast::MetaItem,
+              item: &Annotatable,
+              push: Box<FnMut(P<Annotatable>)>);
+}
+
+impl<F> MultiItemDecorator for F
+    where F : Fn(&mut ExtCtxt, Span, &ast::MetaItem, &Annotatable, Box<FnMut(P<Annotatable>)>)
+{
+    fn expand(&self,
+              ecx: &mut ExtCtxt,
+              sp: Span,
+              meta_item: &ast::MetaItem,
+              item: &Annotatable,
+              push: Box<FnMut(P<Annotatable>)>) {
+        (*self)(ecx, sp, meta_item, item, push)
+    }
+}
+
 // A more flexible ItemModifier (ItemModifier should go away, eventually, FIXME).
 // meta_item is the annotation, item is the item being modified, parent_item
 // is the impl or trait item is declared in if item is part of such a thing.