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Convert it into a warning 

Co-authored-by: León Orell Valerian Liehr <me@fmease.dev>
This commit is contained in:
Nilstrieb 2023-08-22 10:19:57 +02:00
parent 1b9159e448
commit d16e9c3369
1 changed files with 6 additions and 1 deletions
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7
compiler/rustc_index/src/lib.rs
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@ -29,13 +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.
/// Note to the reader: Emitting hard errors from size assertions like this is generally not
///
/// <div class="warning">
///
/// 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.
///
/// </div>
#[macro_export]
macro_rules! static_assert_size {
($ty:ty, $size:expr) => {