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/issues/issue-26905.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 tests/ui/issues/issue-26905.rs

(limited to 'tests/ui/issues/issue-26905.rs')

diff --git a/tests/ui/issues/issue-26905.rs b/tests/ui/issues/issue-26905.rs
new file mode 100644
index 000000000..4c5c67d58
--- /dev/null
+++ b/tests/ui/issues/issue-26905.rs
@@ -0,0 +1,23 @@
+#![feature(unsize, coerce_unsized)]
+
+// Verfies that non-PhantomData ZSTs still cause coercions to fail.
+// They might have additional semantics that we don't want to bulldoze.
+
+use std::marker::{Unsize, PhantomData};
+use std::ops::CoerceUnsized;
+
+struct NotPhantomData<T: ?Sized>(PhantomData<T>);
+
+struct MyRc<T: ?Sized> {
+    _ptr: *const T,
+    _boo: NotPhantomData<T>,
+}
+
+impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<MyRc<U>> for MyRc<T>{ } //~ERROR
+
+fn main() {
+    let data = [1, 2, 3];
+    let iter = data.iter();
+    let x = MyRc { _ptr: &iter, _boo: NotPhantomData(PhantomData) };
+    let _y: MyRc<dyn Iterator<Item=&u32>> = x;
+}
-- 
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