1 files changed, 34 insertions, 0 deletions
diff --git a/src/tools/clippy/clippy_lints/src/methods/bytes_nth.rs b/src/tools/clippy/clippy_lints/src/methods/bytes_nth.rs
new file mode 100644
index 000000000..44857d61f
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/methods/bytes_nth.rs
@@ -0,0 +1,34 @@
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::is_type_diagnostic_item;
+use rustc_errors::Applicability;
+use rustc_hir::Expr;
+use rustc_lint::LateContext;
+use rustc_span::sym;
+
+use super::BYTES_NTH;
+
+pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>, recv: &'tcx Expr<'tcx>, n_arg: &'tcx Expr<'tcx>) {
+    let ty = cx.typeck_results().expr_ty(recv).peel_refs();
+    let caller_type = if ty.is_str() {
+        "str"
+    } else if is_type_diagnostic_item(cx, ty, sym::String) {
+        "String"
+    } else {
+        return;
+    };
+    let mut applicability = Applicability::MachineApplicable;
+    span_lint_and_sugg(
+        cx,
+        BYTES_NTH,
+        expr.span,
+        &format!("called `.bytes().nth()` on a `{}`", caller_type),
+        "try",
+        format!(
+            "{}.as_bytes().get({})",
+            snippet_with_applicability(cx, recv.span, "..", &mut applicability),
+            snippet_with_applicability(cx, n_arg.span, "..", &mut applicability)
+        ),
+        applicability,
+    );
+}