rust: static_assert: add `static_assert!` macro

Add the `static_assert!` macro, which is a compile-time assert, similar
to the C11 `_Static_assert` and C++11 `static_assert` declarations [1,2].
Do so in a new module, called `static_assert`.

For instance:

    static_assert!(42 > 24);
    static_assert!(core::mem::size_of::<u8>() == 1);

    const X: &[u8] = b"bar";
    static_assert!(X[1] == b'a');

    const fn f(x: i32) -> i32 {
        x + 2
    }
    static_assert!(f(40) == 42);

Link: https://en.cppreference.com/w/c/language/_Static_assert [1]
Link: https://en.cppreference.com/w/cpp/language/static_assert [2]
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs
index 345fc9075d1f..178fe8e6cb6d 100644
--- a/rust/kernel/prelude.rs
+++ b/rust/kernel/prelude.rs
@@ -19,6 +19,8 @@ pub use macros::{module, vtable};
 
 pub use super::{dbg, pr_alert, pr_crit, pr_debug, pr_emerg, pr_err, pr_info, pr_notice, pr_warn};
 
+pub use super::static_assert;
+
 pub use super::error::{code::*, Error, Result};
 
 pub use super::{str::CStr, ThisModule};