From 22f788c64417523e838bf367c83f8a426102809a Mon Sep 17 00:00:00 2001
From: Josh Driver <keeperofdakeys@gmail.com>
Date: Sat, 31 Dec 2016 16:02:06 +1030
Subject: Stop macro calls in structs for proc_macro_derive from panicing

---
 src/libsyntax_ext/deriving/custom.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/libsyntax_ext')

diff --git a/src/libsyntax_ext/deriving/custom.rs b/src/libsyntax_ext/deriving/custom.rs
index 6f02a348f91..811aea4a9eb 100644
--- a/src/libsyntax_ext/deriving/custom.rs
+++ b/src/libsyntax_ext/deriving/custom.rs
@@ -12,7 +12,7 @@ use std::panic;
 
 use errors::FatalError;
 use proc_macro::{TokenStream, __internal};
-use syntax::ast::{self, ItemKind, Attribute};
+use syntax::ast::{self, ItemKind, Attribute, Mac};
 use syntax::attr::{mark_used, mark_known};
 use syntax::codemap::Span;
 use syntax::ext::base::*;
@@ -28,6 +28,9 @@ impl<'a> Visitor<'a> for MarkAttrs<'a> {
             mark_known(attr);
         }
     }
+
+    fn visit_mac(&mut self, _mac: &Mac) {
+    }
 }
 
 pub struct CustomDerive {
-- 
cgit 1.4.1-3-g733a5