diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index ff5c16f2b3e..63d71a73cdf 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -12,7 +12,7 @@
 use rustc_const_eval::const_eval::is_unstable_const_fn;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir::def::{CtorKind, DefKind, Res};
-use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
 use rustc_hir::lang_items::LangItem;
 use rustc_hir::{BodyId, Mutability};
 use rustc_hir_analysis::check::intrinsic::intrinsic_operation_unsafety;
@@ -88,6 +88,11 @@ pub(crate) fn as_def_id(self) -> Option<DefId> {
         }
     }
 
+    #[inline]
+    pub(crate) fn as_local_def_id(self) -> Option<LocalDefId> {
+        self.as_def_id().and_then(|id| id.as_local())
+    }
+
     #[inline]
     pub(crate) fn krate(self) -> CrateNum {
         match self {
diff --git a/src/librustdoc/doctest/rust.rs b/src/librustdoc/doctest/rust.rs
index abd66f15dc0..5c0898f28fc 100644
--- a/src/librustdoc/doctest/rust.rs
+++ b/src/librustdoc/doctest/rust.rs
@@ -136,7 +136,7 @@ fn visit_testable<F: FnOnce(&mut Self)>(
                 self.enable_per_target_ignores,
                 Some(&crate::html::markdown::ExtraInfo::new(
                     self.tcx,
-                    def_id.to_def_id(),
+                    def_id,
                     span_of_fragments(&attrs.doc_strings).unwrap_or(sp),
                 )),
             );
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 7bfe5d87d39..364d4e077b1 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -40,7 +40,7 @@
 };
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{Diag, DiagMessage};
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::LocalDefId;
 use rustc_middle::ty::TyCtxt;
 pub(crate) use rustc_resolve::rustdoc::main_body_opts;
 use rustc_resolve::rustdoc::may_be_doc_link;
@@ -818,27 +818,25 @@ pub(crate) fn find_codes<T: doctest::DocTestVisitor>(
 }
 
 pub(crate) struct ExtraInfo<'tcx> {
-    def_id: DefId,
+    def_id: LocalDefId,
     sp: Span,
     tcx: TyCtxt<'tcx>,
 }
 
 impl<'tcx> ExtraInfo<'tcx> {
-    pub(crate) fn new(tcx: TyCtxt<'tcx>, def_id: DefId, sp: Span) -> ExtraInfo<'tcx> {
+    pub(crate) fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId, sp: Span) -> ExtraInfo<'tcx> {
         ExtraInfo { def_id, sp, tcx }
     }
 
     fn error_invalid_codeblock_attr(&self, msg: impl Into<DiagMessage>) {
-        if let Some(def_id) = self.def_id.as_local() {
-            self.tcx.node_span_lint(
-                crate::lint::INVALID_CODEBLOCK_ATTRIBUTES,
-                self.tcx.local_def_id_to_hir_id(def_id),
-                self.sp,
-                |lint| {
-                    lint.primary_message(msg);
-                },
-            );
-        }
+        self.tcx.node_span_lint(
+            crate::lint::INVALID_CODEBLOCK_ATTRIBUTES,
+            self.tcx.local_def_id_to_hir_id(self.def_id),
+            self.sp,
+            |lint| {
+                lint.primary_message(msg);
+            },
+        );
     }
 
     fn error_invalid_codeblock_attr_with_help(
@@ -846,17 +844,15 @@ fn error_invalid_codeblock_attr_with_help(
         msg: impl Into<DiagMessage>,
         f: impl for<'a, 'b> FnOnce(&'b mut Diag<'a, ()>),
     ) {
-        if let Some(def_id) = self.def_id.as_local() {
-            self.tcx.node_span_lint(
-                crate::lint::INVALID_CODEBLOCK_ATTRIBUTES,
-                self.tcx.local_def_id_to_hir_id(def_id),
-                self.sp,
-                |lint| {
-                    lint.primary_message(msg);
-                    f(lint);
-                },
-            );
-        }
+        self.tcx.node_span_lint(
+            crate::lint::INVALID_CODEBLOCK_ATTRIBUTES,
+            self.tcx.local_def_id_to_hir_id(self.def_id),
+            self.sp,
+            |lint| {
+                lint.primary_message(msg);
+                f(lint);
+            },
+        );
     }
 }
 
diff --git a/src/librustdoc/passes/lint/check_code_block_syntax.rs b/src/librustdoc/passes/lint/check_code_block_syntax.rs
index ef05befdddc..977c0953336 100644
--- a/src/librustdoc/passes/lint/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/lint/check_code_block_syntax.rs
@@ -16,9 +16,11 @@
 use crate::html::markdown::{self, RustCodeBlock};
 
 pub(crate) fn visit_item(cx: &DocContext<'_>, item: &clean::Item) {
-    if let Some(dox) = &item.opt_doc_value() {
+    if let Some(def_id) = item.item_id.as_local_def_id()
+        && let Some(dox) = &item.opt_doc_value()
+    {
         let sp = item.attr_span(cx.tcx);
-        let extra = crate::html::markdown::ExtraInfo::new(cx.tcx, item.item_id.expect_def_id(), sp);
+        let extra = crate::html::markdown::ExtraInfo::new(cx.tcx, def_id, sp);
         for code_block in markdown::rust_code_blocks(dox, &extra) {
             check_rust_syntax(cx, item, dox, code_block);
         }