From 01db3b6f4ec2df11a9cc85020db66d35f9bcbb52 Mon Sep 17 00:00:00 2001
From: Michael Sproul <michael@sigmaprime.io>
Date: Mon, 30 Sep 2019 12:32:44 +1000
Subject: [PATCH] Fix SignedRoot macro attribute parsing

---
 eth2/utils/tree_hash_derive/src/lib.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/eth2/utils/tree_hash_derive/src/lib.rs b/eth2/utils/tree_hash_derive/src/lib.rs
index 1e702c53c..e396b4fda 100644
--- a/eth2/utils/tree_hash_derive/src/lib.rs
+++ b/eth2/utils/tree_hash_derive/src/lib.rs
@@ -2,7 +2,7 @@
 extern crate proc_macro;
 
 use proc_macro::TokenStream;
-use quote::{quote, ToTokens};
+use quote::quote;
 use syn::{parse_macro_input, DeriveInput};
 
 /// Returns a Vec of `syn::Ident` for each named field in the struct, whilst filtering out fields
@@ -130,8 +130,8 @@ fn get_signed_root_named_field_idents(struct_data: &syn::DataStruct) -> Vec<&syn
 }
 
 fn should_skip_signed_root(field: &syn::Field) -> bool {
-    field
-        .attrs
-        .iter()
-        .any(|attr| attr.into_token_stream().to_string() == "# [ signed_root ( skip_hashing ) ]")
+    field.attrs.iter().any(|attr| {
+        attr.path.is_ident("signed_root")
+            && attr.tts.to_string().replace(" ", "") == "(skip_hashing)"
+    })
 }