From b4eb0992614acc242169154d434db658ef6790e0 Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Sun, 6 Sep 2020 12:41:28 -0400
Subject: [PATCH] Verify we compile std without involving a b host compiler

---
 src/bootstrap/builder/tests.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/bootstrap/builder/tests.rs b/src/bootstrap/builder/tests.rs
index 144c4dc4c9514..c6eac95c34507 100644
--- a/src/bootstrap/builder/tests.rs
+++ b/src/bootstrap/builder/tests.rs
@@ -217,6 +217,16 @@ mod dist {
                 dist::Std { compiler: Compiler { host: a, stage: 1 }, target: b },
             ]
         );
+        assert_eq!(
+            first(builder.cache.all::<compile::Std>()),
+            &[
+                compile::Std { compiler: Compiler { host: a, stage: 0 }, target: a },
+                compile::Std { compiler: Compiler { host: a, stage: 1 }, target: a },
+                compile::Std { compiler: Compiler { host: a, stage: 2 }, target: a },
+                compile::Std { compiler: Compiler { host: a, stage: 1 }, target: b },
+                compile::Std { compiler: Compiler { host: a, stage: 2 }, target: b },
+            ],
+        );
         assert_eq!(first(builder.cache.all::<dist::Src>()), &[dist::Src]);
     }