From 90fb08c229d444442df745da286d613d1679192f Mon Sep 17 00:00:00 2001
From: Rain <rain1@fb.com>
Date: Tue, 12 Mar 2019 18:19:16 -0700
Subject: [PATCH] add AsRef<Index> impl for Index
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This is useful for generic code, as the comment says. As a workaround
I've had to define a newtype wrapper around `Index` to achieve the same
goal, so it would be lovely to have this be upstream! 😄
---
 proptest/src/sample.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/proptest/src/sample.rs b/proptest/src/sample.rs
index 65b46943..919903c4 100644
--- a/proptest/src/sample.rs
+++ b/proptest/src/sample.rs
@@ -244,6 +244,14 @@ impl Index {
     }
 }
 
+// This impl is handy for generic code over any type that exposes an internal `Index` -- with it,
+// a plain `Index` can be passed in as well.
+impl AsRef<Index> for Index {
+    fn as_ref(&self) -> &Index {
+        self
+    }
+}
+
 mapfn! {
     [] fn UsizeToIndex[](raw: usize) -> Index {
         Index(raw)