From fb3dd9f64ee9b34d6d0e25363ceda3a6ba9dcec3 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Fri, 9 Nov 2018 10:10:46 +1100
Subject: Add a static assertion about the size of `ast::Expr`.

---
 src/libsyntax/ast.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/libsyntax')

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 2f17bc0548c..fa6fe347833 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -20,6 +20,7 @@ use print::pprust;
 use ptr::P;
 use rustc_data_structures::indexed_vec;
 use rustc_data_structures::indexed_vec::Idx;
+use rustc_data_structures::static_assert;
 use rustc_target::spec::abi::Abi;
 use source_map::{dummy_spanned, respan, Spanned};
 use symbol::{keywords, Symbol};
@@ -924,6 +925,10 @@ pub struct Expr {
     pub attrs: ThinVec<Attribute>,
 }
 
+// `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
+#[cfg(target_arch = "x86_64")]
+static_assert!(MEM_SIZE_OF_EXPR: std::mem::size_of::<Expr>() == 88);
+
 impl Expr {
     /// Whether this expression would be valid somewhere that expects a value, for example, an `if`
     /// condition.
-- 
cgit 1.4.1-3-g733a5