rust: move `static_assert` into `build_assert`

Conceptually, `static_assert` is also a build-time assertion that occurs
earlier in the pipeline. Consolidate the implementation so that we can use
this as the canonical place to add more useful build-time assertions.

Reviewed-by: Yury Norov <ynorov@nvidia.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260319121653.2975748-2-gary@kernel.org
[ Used kernel vertical style. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 0 insertions, 39 deletions

diff --git a/rust/kernel/static_assert.rs b/rust/kernel/static_assert.rs
deleted file mode 100644
index a57ba14315a0..000000000000
--- a/rust/kernel/static_assert.rs
+++ /dev/null
@@ -1,39 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-//! Static assert.
-
-/// Static assert (i.e. compile-time assert).
-///
-/// Similar to C11 [`_Static_assert`] and C++11 [`static_assert`].
-///
-/// An optional panic message can be supplied after the expression.
-/// Currently only a string literal without formatting is supported
-/// due to constness limitations of the [`assert!`] macro.
-///
-/// The feature may be added to Rust in the future: see [RFC 2790].
-///
-/// [`_Static_assert`]: https://en.cppreference.com/w/c/language/_Static_assert
-/// [`static_assert`]: https://en.cppreference.com/w/cpp/language/static_assert
-/// [RFC 2790]: https://github.com/rust-lang/rfcs/issues/2790
-///
-/// # Examples
-///
-/// ```
-/// 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);
-/// static_assert!(f(40) == 42, "f(x) must add 2 to the given input.");
-/// ```
-#[macro_export]
-macro_rules! static_assert {
-    ($condition:expr $(,$arg:literal)?) => {
-        const _: () = ::core::assert!($condition $(,$arg)?);
-    };
-}