From e02c5b5930c2c9ba3e5423fe12e2ef0155017297 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 30 May 2024 20:31:36 +0200 Subject: Merging upstream version 1.74.1+dfsg1. Signed-off-by: Daniel Baumann --- compiler/rustc_index/src/lib.rs | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'compiler/rustc_index') diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs index 9942c70c4..061c55c01 100644 --- a/compiler/rustc_index/src/lib.rs +++ b/compiler/rustc_index/src/lib.rs @@ -12,7 +12,7 @@ test ) )] -#![cfg_attr(all(not(bootstrap), feature = "nightly"), allow(internal_features))] +#![cfg_attr(feature = "nightly", allow(internal_features))] #[cfg(feature = "nightly")] pub mod bit_set; @@ -29,6 +29,18 @@ pub use {idx::Idx, slice::IndexSlice, vec::IndexVec}; pub use rustc_macros::newtype_index; /// Type size assertion. The first argument is a type and the second argument is its expected size. +/// +///
+/// +/// Emitting hard errors from size assertions like this is generally not +/// recommended, especially in libraries, because they can cause build failures if the layout +/// algorithm or dependencies change. Here in rustc we control the toolchain and layout algorithm, +/// so the former is not a problem. For the latter we have a lockfile as rustc is an application and +/// precompiled library. +/// +/// Short version: Don't copy this macro into your own code. Use a `#[test]` instead. +/// +///
#[macro_export] macro_rules! static_assert_size { ($ty:ty, $size:expr) => { -- cgit v1.2.3