From 8500fb9c6995379027bc2e5b98dcdee00d37ddd1 Mon Sep 17 00:00:00 2001
From: David Teller <D.O.Teller@gmail.com>
Date: Thu, 7 Dec 2017 16:04:59 +0100
Subject: [PATCH] Issue #46555 - Making IndexVec Send if its contents are Send

---
 src/librustc_data_structures/indexed_vec.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/librustc_data_structures/indexed_vec.rs b/src/librustc_data_structures/indexed_vec.rs
index e2f50c8c8891b..19528a1403828 100644
--- a/src/librustc_data_structures/indexed_vec.rs
+++ b/src/librustc_data_structures/indexed_vec.rs
@@ -330,6 +330,10 @@ pub struct IndexVec<I: Idx, T> {
     _marker: PhantomData<Fn(&I)>
 }
 
+// Whether `IndexVec` is `Send` depends only on the data,
+// not the phantom data.
+unsafe impl<I: Idx, T> Send for IndexVec<I, T> where T: Send {}
+
 impl<I: Idx, T: serialize::Encodable> serialize::Encodable for IndexVec<I, T> {
     fn encode<S: serialize::Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
         serialize::Encodable::encode(&self.raw, s)