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/// A simple static assertion macro. The first argument should be a unique /// ALL_CAPS identifier that describes the condition. #[macro_export] #[cfg_attr(stage0, allow_internal_unstable)] #[cfg_attr(not(stage0), allow_internal_unstable(type_ascription))] 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]; } }