remove now-unusued macro

Author: the8472

src/utility_types.rs

@@ -149,14 +149,6 @@ impl<T> Iterator for TokenAtOffset<T> {
 
 impl<T> ExactSizeIterator for TokenAtOffset<T> {}
 
-macro_rules! _static_assert {
-    ($expr:expr) => {
-        const _: i32 = 0 / $expr as i32;
-    };
-}
-
-pub(crate) use _static_assert as static_assert;
-
 #[derive(Copy, Clone, Debug)]
 pub(crate) enum Delta<T> {
     Add(T),