fix semicolon

src/environ.rs

@@ -16,7 +16,7 @@ macro_rules! ensure_tonicity {
                     Some(x) => $check_fn(prev, x) && f(x, &xs[1..]),
                     None => true,
                 }
-            };
+            }
             Ok(Expr::Bool(f(first, rest)))
         }
     }};