Rollup merge of #68424 - estebank:suggest-borrow-for-non-copy-vec, r=davidtwco

[rust.git] / src / librustc_data_structures / macros.rs

diff --git a/src/librustc_data_structures/macros.rs b/src/librustc_data_structures/macros.rs
index 029e7267c8247d40e0e5c91e4292a57966aef2ee..83e6dbedee226165eb05c8fea92cd4953a51fded 100644 (file)
--- a/src/librustc_data_structures/macros.rs
+++ b/src/librustc_data_structures/macros.rs
@@ -1,12 +1,19 @@
-/// A simple static assertion macro. The first argument should be a unique
-/// ALL_CAPS identifier that describes the condition.
+/// A simple static assertion macro.
 #[macro_export]
 #[allow_internal_unstable(type_ascription)]
 macro_rules! static_assert {
-    ($name:ident: $test:expr) => {
+    ($test:expr) => {
         // Use the bool to access an array such that if the bool is false, the access
         // is out-of-bounds.
         #[allow(dead_code)]
-        static $name: () = [()][!($test: bool) as usize];
-    }
+        const _: () = [()][!($test: bool) as usize];
+    };
+}
+
+/// Type size assertion. The first argument is a type and the second argument is its expected size.
+#[macro_export]
+macro_rules! static_assert_size {
+    ($ty:ty, $size:expr) => {
+        const _: [(); $size] = [(); ::std::mem::size_of::<$ty>()];
+    };
 }