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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. /// A simple static assertion macro. The first argument should be a unique /// ALL_CAPS identifier that describes the condition. #[macro_export] #[allow_internal_unstable] macro_rules! static_assert { ($name:ident: $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]; } }