rm diag item, use lang item

2 files changed, 3 insertions, 4 deletions

diff --git a/library/core/src/ffi/c_str.rs b/library/core/src/ffi/c_str.rs
index 2ac679b6bc3..07b11814f96 100644
--- a/library/core/src/ffi/c_str.rs
+++ b/library/core/src/ffi/c_str.rs
@@ -79,7 +79,6 @@ use crate::str;
 ///
 /// [str]: prim@str "str"
 #[derive(Hash)]
-#[cfg_attr(not(test), rustc_diagnostic_item = "CStr")]
 #[stable(feature = "core_c_str", since = "1.64.0")]
 #[rustc_has_incoherent_inherent_impls]
 #[cfg_attr(not(bootstrap), lang = "CStr")]
diff --git a/src/tools/clippy/clippy_lints/src/strlen_on_c_strings.rs b/src/tools/clippy/clippy_lints/src/strlen_on_c_strings.rs
index 03324c66e8e..2f2e84fa35a 100644
--- a/src/tools/clippy/clippy_lints/src/strlen_on_c_strings.rs
+++ b/src/tools/clippy/clippy_lints/src/strlen_on_c_strings.rs
@@ -1,11 +1,11 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_context;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
 use clippy_utils::visitors::is_expr_unsafe;
 use clippy_utils::{get_parent_node, match_libc_symbol};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::{Block, BlockCheckMode, Expr, ExprKind, Node, UnsafeSource};
+use rustc_hir::{Block, BlockCheckMode, Expr, ExprKind, LangItem, Node, UnsafeSource};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::sym;
@@ -67,7 +67,7 @@ impl<'tcx> LateLintPass<'tcx> for StrlenOnCStrings {
                 let val_name = snippet_with_context(cx, self_arg.span, ctxt, "..", &mut app).0;
                 let method_name = if is_type_diagnostic_item(cx, ty, sym::cstring_type) {
                     "as_bytes"
-                } else if is_type_diagnostic_item(cx, ty, sym::CStr) {
+                } else if is_type_lang_item(cx, ty, LangItem::CStr) {
                     "to_bytes"
                 } else {
                     return;