From 9dda6b5d35e6e8a1e405fa9b156dfaec67aef02d Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Mon, 14 Aug 2023 12:05:53 -0700
Subject: [PATCH] Add test for unknown_lints from another file.

---
 .../unknown-lints/allow-in-other-module.rs    | 26 +++++++++++++++++++
 tests/ui/lint/unknown-lints/other.rs          | 10 +++++++
 2 files changed, 36 insertions(+)
 create mode 100644 tests/ui/lint/unknown-lints/allow-in-other-module.rs
 create mode 100644 tests/ui/lint/unknown-lints/other.rs

diff --git a/tests/ui/lint/unknown-lints/allow-in-other-module.rs b/tests/ui/lint/unknown-lints/allow-in-other-module.rs
new file mode 100644
index 0000000000000..20bf0d7af03cb
--- /dev/null
+++ b/tests/ui/lint/unknown-lints/allow-in-other-module.rs
@@ -0,0 +1,26 @@
+// check-pass
+
+// Tests that the unknown_lints lint doesn't fire for an unknown lint loaded from a separate file.
+// The key part is that the stderr output should be empty.
+// Reported in https://github.com/rust-lang/rust/issues/84936
+// Fixed incidentally by https://github.com/rust-lang/rust/pull/97266
+
+// This `allow` should apply to submodules, whether they are inline or loaded from a file.
+#![allow(unknown_lints)]
+#![allow(dead_code)]
+// no warning
+#![allow(not_a_real_lint)]
+
+mod other;
+
+// no warning
+#[allow(not_a_real_lint)]
+fn m() {}
+
+mod mm {
+    // no warning
+    #[allow(not_a_real_lint)]
+    fn m() {}
+}
+
+fn main() {}
diff --git a/tests/ui/lint/unknown-lints/other.rs b/tests/ui/lint/unknown-lints/other.rs
new file mode 100644
index 0000000000000..a5111c00a3ecf
--- /dev/null
+++ b/tests/ui/lint/unknown-lints/other.rs
@@ -0,0 +1,10 @@
+// ignore-test
+
+// Companion to allow-in-other-module.rs
+
+// This should not warn.
+#![allow(not_a_real_lint)]
+
+// This should not warn, either.
+#[allow(not_a_real_lint)]
+fn m() {}