From 8b663dc3ea96d4a64ce8f55ec8fb6ab543e69b4a Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 4 Nov 2024 23:47:27 -0500
Subject: [PATCH] Add ui test of colliding From impls

---
 tests/ui/same-from-type.rs     | 11 +++++++++++
 tests/ui/same-from-type.stderr |  5 +++++
 2 files changed, 16 insertions(+)
 create mode 100644 tests/ui/same-from-type.rs
 create mode 100644 tests/ui/same-from-type.stderr

diff --git a/tests/ui/same-from-type.rs b/tests/ui/same-from-type.rs
new file mode 100644
index 0000000..bc32b07
--- /dev/null
+++ b/tests/ui/same-from-type.rs
@@ -0,0 +1,11 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("failed to open")]
+    OpenFile(#[from] std::io::Error),
+    #[error("failed to close")]
+    CloseFIle(#[from] std::io::Error),
+}
+
+fn main() {}
diff --git a/tests/ui/same-from-type.stderr b/tests/ui/same-from-type.stderr
new file mode 100644
index 0000000..1e33385
--- /dev/null
+++ b/tests/ui/same-from-type.stderr
@@ -0,0 +1,5 @@
+error: cannot derive From because another variant has the same source type
+ --> tests/ui/same-from-type.rs:8:15
+  |
+8 |     CloseFIle(#[from] std::io::Error),
+  |               ^^^^^^^^^^^^^^^^^^^^^^