add change, and testcase

Author: FwP-IDN

src/items.rs

@@ -2,7 +2,6 @@
 
 use std::borrow::Cow;
 use std::cmp::{Ordering, max, min};
-use std::backtrace::Backtrace;
 
 use regex::Regex;
 use rustc_ast::visit;
@@ -1931,10 +1930,6 @@ impl Rewrite for ast::FieldDef {
     }
 }
 
-use std::sync::atomic::{AtomicUsize};
-
-static CALL_COUNT: AtomicUsize = AtomicUsize::new(0);
-
 pub(crate) fn rewrite_struct_field(
     context: &RewriteContext<'_>,
     field: &ast::FieldDef,