Removes all warnings

src/prover/tracing.rs

@@ -1,10 +1,9 @@
-use std::{cell::RefCell, default, fmt::Display, rc::Rc};
-
 use log::info;
 use owo_colors::{
     OwoColorize, Style,
     colors::css::{DarkGray, Gray},
 };
+use std::fmt::Display;
 
 use crate::ast::Variable;