From 98e11b8aeddf5b259a8c839c346fd26c03efc50d Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 1 Aug 2022 12:07:31 -0400
Subject: [PATCH] fix for unions with scalar layout

---
 compiler/rustc_middle/src/ty/layout_sanity_check.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler/rustc_middle/src/ty/layout_sanity_check.rs b/compiler/rustc_middle/src/ty/layout_sanity_check.rs
index 95bc81517da0..38dc65338371 100644
--- a/compiler/rustc_middle/src/ty/layout_sanity_check.rs
+++ b/compiler/rustc_middle/src/ty/layout_sanity_check.rs
@@ -91,6 +91,10 @@ pub(super) fn sanity_check_layout<'tcx>(
                         FieldsShape::Primitive => {
                             // Fine.
                         }
+                        FieldsShape::Union(..) => {
+                            // FIXME: I guess we could also check something here? Like, look at all fields?
+                            return;
+                        }
                         FieldsShape::Arbitrary { .. } => {
                             // Should be an enum, the only field is the discriminant.
                             assert!(