Further changes required by Servo

components/size_of_test/lib.rs

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+pub use static_assertions::const_assert_eq;
+
+/// Asserts the size of a type at compile time.
+#[macro_export]
+macro_rules! size_of_test {
+    ($t: ty, $expected_size: expr) => {
+        #[cfg(target_pointer_width = "64")]
+        $crate::const_assert_eq!(std::mem::size_of::<$t>(), $expected_size);
+    };
+}