From 351e78de265f1519d6d9021878fa0950985093a3 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Tue, 3 Jul 2018 06:50:54 -0400
Subject: [PATCH] add `assert_crate_local` method to `ClearCrossCrate`

---
 src/librustc/mir/mod.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/librustc/mir/mod.rs b/src/librustc/mir/mod.rs
index 78c4966c6f9..cd4b32735e5 100644
--- a/src/librustc/mir/mod.rs
+++ b/src/librustc/mir/mod.rs
@@ -380,6 +380,15 @@ pub enum ClearCrossCrate<T> {
     Set(T),
 }
 
+impl<T> ClearCrossCrate<T> {
+    pub fn assert_crate_local(self) -> T {
+        match self {
+            ClearCrossCrate::Clear => bug!("unwrapping cross-crate data"),
+            ClearCrossCrate::Set(v) => v,
+        }
+    }
+}
+
 impl<T: serialize::Encodable> serialize::UseSpecializedEncodable for ClearCrossCrate<T> {}
 impl<T: serialize::Decodable> serialize::UseSpecializedDecodable for ClearCrossCrate<T> {}