From 3a80d0325a6d77589124b44f853b11a0d47b9f9e Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 15 Jun 2020 16:12:11 -0700
Subject: [PATCH] Add test involving unused_qualifications

---
 tests/test_lints.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 tests/test_lints.rs

diff --git a/tests/test_lints.rs b/tests/test_lints.rs
new file mode 100644
index 0000000..b3b44b2
--- /dev/null
+++ b/tests/test_lints.rs
@@ -0,0 +1,16 @@
+use thiserror::Error;
+
+pub use std::error::Error;
+
+#[test]
+fn test_unused_qualifications() {
+    #![deny(unused_qualifications)]
+
+    // Expansion of derive(Error) macro can't know whether something like
+    // std::error::Error is already imported in the caller's scope so it must
+    // suppress unused_qualifications.
+
+    #[derive(Debug, Error)]
+    #[error("...")]
+    pub struct MyError;
+}