Use symbols instead of `&str` when possible

1 files changed, 2 insertions, 2 deletions

diff --git a/clippy_lints/src/index_refutable_slice.rs b/clippy_lints/src/index_refutable_slice.rs
index 989997d69f7..0b1cae30ca5 100644
--- a/clippy_lints/src/index_refutable_slice.rs
+++ b/clippy_lints/src/index_refutable_slice.rs
@@ -4,7 +4,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::higher::IfLet;
 use clippy_utils::msrvs::{self, Msrv};
 use clippy_utils::ty::is_copy;
-use clippy_utils::{is_expn_of, is_lint_allowed, path_to_local};
+use clippy_utils::{is_expn_of, is_lint_allowed, path_to_local, sym};
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
@@ -72,7 +72,7 @@ impl_lint_pass!(IndexRefutableSlice => [INDEX_REFUTABLE_SLICE]);
 impl<'tcx> LateLintPass<'tcx> for IndexRefutableSlice {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
         if let Some(IfLet { let_pat, if_then, .. }) = IfLet::hir(cx, expr)
-            && (!expr.span.from_expansion() || is_expn_of(expr.span, "if_chain").is_some())
+            && (!expr.span.from_expansion() || is_expn_of(expr.span, sym::if_chain).is_some())
             && !is_lint_allowed(cx, INDEX_REFUTABLE_SLICE, expr.hir_id)
             && let found_slices = find_slice_values(cx, let_pat)
             && !found_slices.is_empty()