From b9e7449b437078f30783cb4b0645cae22a3d4adf Mon Sep 17 00:00:00 2001
From: Dzmitry Malyshau <kvarkus@gmail.com>
Date: Wed, 22 Jan 2020 19:48:32 -0500
Subject: [PATCH] Fix building on Rust 1.37

It doesn't like by-move pattern with an `if`
---
 wgpu-core/src/track/mod.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/wgpu-core/src/track/mod.rs b/wgpu-core/src/track/mod.rs
index fdbf96249..5116d9c40 100644
--- a/wgpu-core/src/track/mod.rs
+++ b/wgpu-core/src/track/mod.rs
@@ -216,10 +216,14 @@ impl<S: ResourceState> ResourceTracker<S> {
         let (index, epoch, backend) = id.unzip();
         debug_assert_eq!(backend, self.backend);
         match self.map.entry(index) {
-            Entry::Occupied(e) if e.get().ref_count.load() == 1 => {
-                let res = e.remove();
-                assert_eq!(res.epoch, epoch);
-                true
+            Entry::Occupied(e) => {
+                if e.get().ref_count.load() == 1 {
+                    let res = e.remove();
+                    assert_eq!(res.epoch, epoch);
+                    true
+                } else {
+                    false
+                }
             }
             _ => false,
         }