From 68a13646f9e5b46e402f2a8a77d720317d0d3399 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Mon, 10 Dec 2018 07:17:39 -0800
Subject: [PATCH] Add a from_u32 function to EntityRef.

This eliminates the need for casting in common cases.
---
 lib/entity/src/lib.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/entity/src/lib.rs b/lib/entity/src/lib.rs
index e445c0d8a4..e86ea0d8fd 100644
--- a/lib/entity/src/lib.rs
+++ b/lib/entity/src/lib.rs
@@ -100,6 +100,13 @@ macro_rules! entity_impl {
         }
 
         impl $entity {
+            /// Return the underlying index value as a `u32`.
+            #[allow(dead_code)]
+            pub fn from_u32(x: u32) -> Self {
+                debug_assert!(x < $crate::__core::u32::MAX);
+                $entity(x)
+            }
+
             /// Return the underlying index value as a `u32`.
             #[allow(dead_code)]
             pub fn as_u32(self) -> u32 {