From eae682051618872646c22db68919a803486ec36e Mon Sep 17 00:00:00 2001
From: Rob Ede <robjtede@icloud.com>
Date: Mon, 6 Apr 2020 01:35:37 +0100
Subject: [PATCH] impl default for canvas cache

---
 wgpu/src/widget/canvas/layer/cache.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/wgpu/src/widget/canvas/layer/cache.rs b/wgpu/src/widget/canvas/layer/cache.rs
index 20a095bdde..feebb812a7 100644
--- a/wgpu/src/widget/canvas/layer/cache.rs
+++ b/wgpu/src/widget/canvas/layer/cache.rs
@@ -13,7 +13,7 @@ use std::{cell::RefCell, marker::PhantomData, sync::Arc};
 ///
 /// [`Layer`]: ../trait.Layer.html
 /// [`Cache`]: struct.Cache.html
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Cache<T: Drawable> {
     input: PhantomData<T>,
     state: RefCell<State>,
@@ -27,6 +27,12 @@ enum State {
     },
 }
 
+impl Default for State {
+    fn default() -> Self {
+        State::Empty
+    }
+}
+
 impl<T> Cache<T>
 where
     T: Drawable + std::fmt::Debug,
@@ -37,7 +43,7 @@ where
     pub fn new() -> Self {
         Cache {
             input: PhantomData,
-            state: RefCell::new(State::Empty),
+            state: RefCell::new(State::default()),
         }
     }