diff --git a/clippy_lints/src/booleans.rs b/clippy_lints/src/booleans.rs
index c5da0af6f4d1..670c1a9def56 100644
--- a/clippy_lints/src/booleans.rs
+++ b/clippy_lints/src/booleans.rs
@@ -251,11 +251,12 @@ fn simplify_not(cx: &LateContext<'_, '_>, expr: &Expr) -> Option<String> {
             if !match_type(cx, type_of_receiver, &paths::OPTION) && !match_type(cx, type_of_receiver, &paths::RESULT) {
                 return None;
             }
+            let ident_name: &str = &path.ident.name.as_str();
             METHODS_WITH_NEGATION
                 .iter()
                 .cloned()
                 .flat_map(|(a, b)| vec![(a, b), (b, a)])
-                .find(|&(a, _)| a == path.ident.name.as_str())
+                .find(|&(a, _)| a == ident_name)
                 .and_then(|(_, neg_method)| Some(format!("{}.{}()", snippet_opt(cx, args[0].span)?, neg_method)))
         },
         _ => None,
diff --git a/clippy_lints/src/functions.rs b/clippy_lints/src/functions.rs
index 5b2619aa9ba7..779165cd6c89 100644
--- a/clippy_lints/src/functions.rs
+++ b/clippy_lints/src/functions.rs
@@ -464,7 +464,7 @@ fn check_must_use_candidate<'a, 'tcx>(
 fn must_use_attr(attrs: &[Attribute]) -> Option<&Attribute> {
     attrs
         .iter()
-        .find(|attr| attr.ident().map_or(false, |ident| "must_use" == &ident.as_str()))
+        .find(|attr| attr.ident().map_or(false, |ident| sym!("must_use") == ident.name))
 }
 
 fn returns_unit(decl: &hir::FnDecl) -> bool {