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/// Unconditionally causes parsing to fail with the given error message. #[macro_export] macro_rules! compile_error { ($fmt:expr, $($args:tt)*) => { return ::syn::parse::Error::new( ::proc_macro2::Span::call_site(), format!($fmt, $($args)*), ) .to_compile_error() .into() }; ($fmt:expr) => { compile_error!($fmt,) }; }