Remove unused

Author: c410-f3r

clippy_lints/src/operators/arithmetic_side_effects.rs

@@ -10,10 +10,7 @@ use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::Ty;
 use rustc_session::impl_lint_pass;
-use rustc_span::{
-    source_map::{Span, Spanned},
-    sym,
-};
+use rustc_span::source_map::{Span, Spanned};
 
 const HARD_CODED_ALLOWED: &[&str] = &[
     "&str",