diff --git a/clippy_lints/src/functions/mod.rs b/clippy_lints/src/functions/mod.rs
index 6051dc9479ba..a7e915ecc6db 100644
--- a/clippy_lints/src/functions/mod.rs
+++ b/clippy_lints/src/functions/mod.rs
@@ -503,7 +503,7 @@ impl<'tcx> LateLintPass<'tcx> for Functions {
     ) {
         let hir_id = cx.tcx.local_def_id_to_hir_id(def_id);
         too_many_arguments::check_fn(cx, kind, decl, span, hir_id, self.too_many_arguments_threshold);
-        too_many_lines::check_fn(cx, kind, span, body, self.too_many_lines_threshold);
+        too_many_lines::check_fn(cx, kind, body, span, def_id, self.too_many_lines_threshold);
         not_unsafe_ptr_arg_deref::check_fn(cx, kind, decl, body, def_id);
         misnamed_getters::check_fn(cx, kind, decl, body, span);
         impl_trait_in_params::check_fn(cx, &kind, body, hir_id);
diff --git a/clippy_lints/src/functions/too_many_lines.rs b/clippy_lints/src/functions/too_many_lines.rs
index 4f90d9655b44..33eede8e65ac 100644
--- a/clippy_lints/src/functions/too_many_lines.rs
+++ b/clippy_lints/src/functions/too_many_lines.rs
@@ -1,6 +1,7 @@
 use clippy_utils::diagnostics::span_lint;
 use clippy_utils::source::SpanRangeExt;
 use rustc_hir as hir;
+use rustc_hir::def_id::LocalDefId;
 use rustc_hir::intravisit::FnKind;
 use rustc_lint::{LateContext, LintContext};
 use rustc_span::Span;
@@ -10,8 +11,9 @@ use super::TOO_MANY_LINES;
 pub(super) fn check_fn(
     cx: &LateContext<'_>,
     kind: FnKind<'_>,
-    span: Span,
     body: &hir::Body<'_>,
+    span: Span,
+    def_id: LocalDefId,
     too_many_lines_threshold: u64,
 ) {
     // Closures must be contained in a parent body, which will be checked for `too_many_lines`.
@@ -74,7 +76,7 @@ pub(super) fn check_fn(
         span_lint(
             cx,
             TOO_MANY_LINES,
-            span,
+            cx.tcx.def_span(def_id),
             format!("this function has too many lines ({line_count}/{too_many_lines_threshold})"),
         );
     }
diff --git a/tests/ui-toml/functions_maxlines/test.stderr b/tests/ui-toml/functions_maxlines/test.stderr
index 14a49cb76c1c..e856963c87d1 100644
--- a/tests/ui-toml/functions_maxlines/test.stderr
+++ b/tests/ui-toml/functions_maxlines/test.stderr
@@ -1,12 +1,8 @@
 error: this function has too many lines (2/1)
   --> tests/ui-toml/functions_maxlines/test.rs:19:1
    |
-LL | / fn too_many_lines() {
-LL | |
-LL | |     println!("This is bad.");
-LL | |     println!("This is bad.");
-LL | | }
-   | |_^
+LL | fn too_many_lines() {
+   | ^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::too-many-lines` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::too_many_lines)]`
@@ -14,35 +10,20 @@ LL | | }
 error: this function has too many lines (4/1)
   --> tests/ui-toml/functions_maxlines/test.rs:26:1
    |
-LL | / async fn async_too_many_lines() {
-LL | |
-LL | |     println!("This is bad.");
-LL | |     println!("This is bad.");
-LL | | }
-   | |_^
+LL | async fn async_too_many_lines() {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: this function has too many lines (4/1)
   --> tests/ui-toml/functions_maxlines/test.rs:33:1
    |
-LL | / fn closure_too_many_lines() {
-LL | |
-LL | |     let _ = {
-LL | |         println!("This is bad.");
-LL | |         println!("This is bad.");
-LL | |     };
-LL | | }
-   | |_^
+LL | fn closure_too_many_lines() {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: this function has too many lines (2/1)
   --> tests/ui-toml/functions_maxlines/test.rs:56:1
    |
-LL | / fn comment_before_code() {
-LL | |
-LL | |     let _ = "test";
-LL | |     /* This comment extends to the front of
-LL | |     the code but this line should still count. */ let _ = 5;
-LL | | }
-   | |_^
+LL | fn comment_before_code() {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/functions_maxlines.rs b/tests/ui/functions_maxlines.rs
index e0990dadaaa9..b07145524618 100644
--- a/tests/ui/functions_maxlines.rs
+++ b/tests/ui/functions_maxlines.rs
@@ -1,3 +1,4 @@
+#![allow(clippy::unused_unit, clippy::missing_safety_doc)]
 #![warn(clippy::too_many_lines)]
 
 fn good_lines() {
@@ -55,7 +56,8 @@ fn good_lines() {
     println!("This is good.");
 }
 
-fn bad_lines() {
+#[allow(unused)] // the attr shouldn't get included in the highlight
+pub async unsafe extern "Rust" fn bad_lines() -> () {
     //~^ too_many_lines
 
     println!("Dont get confused by braces: {{}}");
@@ -162,4 +164,115 @@ fn bad_lines() {
     println!("This is bad.");
 }
 
+struct Foo;
+impl Foo {
+    #[allow(unused)] // the attr shouldn't get included in the highlight
+    pub async unsafe extern "Rust" fn bad_lines() -> () {
+        //~^ too_many_lines
+
+        println!("Dont get confused by braces: {{}}");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+        println!("This is bad.");
+    }
+}
+
 fn main() {}
diff --git a/tests/ui/functions_maxlines.stderr b/tests/ui/functions_maxlines.stderr
index f42a2b2a22a2..4c3faf45c472 100644
--- a/tests/ui/functions_maxlines.stderr
+++ b/tests/ui/functions_maxlines.stderr
@@ -1,17 +1,17 @@
-error: this function has too many lines (102/100)
-  --> tests/ui/functions_maxlines.rs:58:1
+error: this function has too many lines (104/100)
+  --> tests/ui/functions_maxlines.rs:60:1
    |
-LL | / fn bad_lines() {
-LL | |
-LL | |
-LL | |     println!("Dont get confused by braces: {{}}");
-...  |
-LL | |     println!("This is bad.");
-LL | | }
-   | |_^
+LL | pub async unsafe extern "Rust" fn bad_lines() -> () {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::too-many-lines` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::too_many_lines)]`
 
-error: aborting due to 1 previous error
+error: this function has too many lines (104/100)
+  --> tests/ui/functions_maxlines.rs:170:5
+   |
+LL |     pub async unsafe extern "Rust" fn bad_lines() -> () {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors