wrap expr call in braces

src/passive/fufufu.rs

@@ -5,7 +5,9 @@ use serenity::async_trait;
 use serenity::model::channel::Message;
 use serenity::prelude::{Context, EventHandler};
 
-simple_responder!(FufufuResponder, r"(?:[fF][uU]){3,}", (get_desu()));
+// Yes, the blocks are necessary, rustc is bugged; check macro declaration
+// for more info.
+simple_responder!(FufufuResponder, r"(?:[fF][uU]){3,}", { get_desu() });
 
 const DESU_STRINGS: &[&str] = &[
     "です。",