rustfmt

Signed-off-by: Ava Hahn <ava@aidanis.online>

src/lex.rs

@@ -151,7 +151,7 @@ fn process(document: &String) -> Result<Box<Seg>, String> {
                 return Err("Empty token".to_string());
             }
 
-            let mut current_seg = ref_stack.pop().unwrap();
+            let mut current_seg = ref_stack.pop().unwrap_or(Seg::new());
             let obj;
             if is_str {
                 obj = Box::from(Ctr::String(token));