From a4b7ed7a42c716ab9f05e351f003d589124fd55d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:58 +0200
Subject: Adding upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/ui/traits/issue-52893.rs | 57 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 tests/ui/traits/issue-52893.rs

(limited to 'tests/ui/traits/issue-52893.rs')

diff --git a/tests/ui/traits/issue-52893.rs b/tests/ui/traits/issue-52893.rs
new file mode 100644
index 000000000..d72598d5d
--- /dev/null
+++ b/tests/ui/traits/issue-52893.rs
@@ -0,0 +1,57 @@
+// check-fail
+//
+// regression test for issue 52893
+trait At<Name> {
+    type AtRes;
+    fn at(self) -> Self::AtRes;
+}
+
+trait Push<T> {
+    type PushRes;
+    fn push(self, other: T) -> Self::PushRes;
+}
+
+trait AddClass<Name, F> {
+    type AddRes;
+    fn init(self, func: F);
+}
+
+trait ToRef {
+    type RefRes;
+    fn to_ref(&self) -> Self::RefRes;
+}
+
+struct Class<P>(P);
+
+impl<P> Class<P> {
+    fn with<Name, F>(self) -> <Self as AddClass<Name, F>>::AddRes
+    where
+        Self: AddClass<Name, F>,
+    {
+        todo!()
+    }
+
+    fn from<F>(self) -> <Self as AddClass<P, F>>::AddRes
+    where
+        Self: AddClass<P, F>,
+    {
+        todo!()
+    }
+}
+
+impl<F, Name, P> AddClass<Name, F> for Class<P>
+where
+    Self: At<Name>,
+    <Self as At<Name>>::AtRes: Push<F>,
+    <<Self as At<Name>>::AtRes as Push<F>>::PushRes: ToRef<RefRes = Self> + Push<F>,
+{
+    type AddRes = ();
+
+    fn init(self, func: F) {
+        let builder = self.at().push(func);
+        let output = builder.to_ref();
+        builder.push(output); //~ ERROR mismatched types [E0308]
+    }
+}
+
+fn main() {}
-- 
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