From cda162727893f87ce510ab1832254040e6945bd7 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Wed, 6 May 2020 09:35:11 +1000
Subject: [PATCH] Add a size assertion for `LocalDecl`.

---
 src/librustc_middle/mir/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/librustc_middle/mir/mod.rs b/src/librustc_middle/mir/mod.rs
index adcbaba5a690..599408807e93 100644
--- a/src/librustc_middle/mir/mod.rs
+++ b/src/librustc_middle/mir/mod.rs
@@ -816,6 +816,10 @@ pub struct LocalDecl<'tcx> {
     pub source_info: SourceInfo,
 }
 
+// `LocalDecl` is used a lot. Make sure it doesn't unintentionally get bigger.
+#[cfg(target_arch = "x86_64")]
+static_assert_size!(LocalDecl<'_>, 128);
+
 /// Extra information about a local that's used for diagnostics.
 #[derive(Clone, Debug, RustcEncodable, RustcDecodable, HashStable, TypeFoldable)]
 pub enum LocalInfo<'tcx> {