From 7e7ce10e5b0474e6833c22062c4973f447ca6463 Mon Sep 17 00:00:00 2001
From: yanglsh <yanglsh@shanghaitech.edu.cn>
Date: Wed, 10 Sep 2025 00:10:05 +0800
Subject: [PATCH] fix: `useless_attribute` FP on `deprecated_in_future`

---
 clippy_lints/src/attrs/useless_attribute.rs |  1 +
 clippy_utils/src/sym.rs                     |  1 +
 tests/ui/useless_attribute.fixed            | 10 ++++++++++
 tests/ui/useless_attribute.rs               | 10 ++++++++++
 4 files changed, 22 insertions(+)

diff --git a/clippy_lints/src/attrs/useless_attribute.rs b/clippy_lints/src/attrs/useless_attribute.rs
index b9b5cedb5aa7..1cebc18edc90 100644
--- a/clippy_lints/src/attrs/useless_attribute.rs
+++ b/clippy_lints/src/attrs/useless_attribute.rs
@@ -30,6 +30,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, item: &Item, attrs: &[Attribute]) {
                                 sym::ambiguous_glob_reexports
                                     | sym::dead_code
                                     | sym::deprecated
+                                    | sym::deprecated_in_future
                                     | sym::hidden_glob_reexports
                                     | sym::unreachable_pub
                                     | sym::unused
diff --git a/clippy_utils/src/sym.rs b/clippy_utils/src/sym.rs
index 278101ac27f9..e2570a151584 100644
--- a/clippy_utils/src/sym.rs
+++ b/clippy_utils/src/sym.rs
@@ -125,6 +125,7 @@ generate! {
     cycle,
     cyclomatic_complexity,
     de,
+    deprecated_in_future,
     diagnostics,
     disallowed_types,
     drain,
diff --git a/tests/ui/useless_attribute.fixed b/tests/ui/useless_attribute.fixed
index be4fb55ddfb8..15070dd9c2ca 100644
--- a/tests/ui/useless_attribute.fixed
+++ b/tests/ui/useless_attribute.fixed
@@ -158,3 +158,13 @@ pub mod redundant_imports_issue {
 
     empty!();
 }
+
+pub mod issue15636 {
+    pub mod f {
+        #[deprecated(since = "TBD")]
+        pub mod deprec {}
+    }
+
+    #[allow(deprecated_in_future)]
+    pub use f::deprec;
+}
diff --git a/tests/ui/useless_attribute.rs b/tests/ui/useless_attribute.rs
index 5a1bcf97a5b4..3f530de7fd8e 100644
--- a/tests/ui/useless_attribute.rs
+++ b/tests/ui/useless_attribute.rs
@@ -158,3 +158,13 @@ pub mod redundant_imports_issue {
 
     empty!();
 }
+
+pub mod issue15636 {
+    pub mod f {
+        #[deprecated(since = "TBD")]
+        pub mod deprec {}
+    }
+
+    #[allow(deprecated_in_future)]
+    pub use f::deprec;
+}