From 9918693037dce8aa4bb6f08741b6812923486c18 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 19 Jun 2024 11:26:03 +0200
Subject: Merging upstream version 1.76.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../projection/param-env-trait-candidate-1.rs      | 14 +++++++++++
 .../projection/param-env-trait-candidate-2.rs      | 29 ++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 tests/ui/traits/next-solver/projection/param-env-trait-candidate-1.rs
 create mode 100644 tests/ui/traits/next-solver/projection/param-env-trait-candidate-2.rs

(limited to 'tests/ui/traits/next-solver/projection')

diff --git a/tests/ui/traits/next-solver/projection/param-env-trait-candidate-1.rs b/tests/ui/traits/next-solver/projection/param-env-trait-candidate-1.rs
new file mode 100644
index 000000000..b337c0673
--- /dev/null
+++ b/tests/ui/traits/next-solver/projection/param-env-trait-candidate-1.rs
@@ -0,0 +1,14 @@
+// check-pass
+// compile-flags: -Znext-solver
+
+// See https://github.com/rust-lang/trait-system-refactor-initiative/issues/1
+// a minimization of a pattern in core.
+fn next<T: Iterator<Item = U>, U>(t: &mut T) -> Option<U> {
+    t.next()
+}
+
+fn foo<T: Iterator>(t: &mut T) {
+    let _: Option<T::Item> = next(t);
+}
+
+fn main() {}
diff --git a/tests/ui/traits/next-solver/projection/param-env-trait-candidate-2.rs b/tests/ui/traits/next-solver/projection/param-env-trait-candidate-2.rs
new file mode 100644
index 000000000..db8dc1eb9
--- /dev/null
+++ b/tests/ui/traits/next-solver/projection/param-env-trait-candidate-2.rs
@@ -0,0 +1,29 @@
+// check-pass
+// compile-flags: -Znext-solver
+
+// See https://github.com/rust-lang/trait-system-refactor-initiative/issues/1,
+// a minimization of a pattern in core.
+
+trait Iterator {
+    type Item;
+}
+
+struct Flatten<I>(I);
+
+impl<I, U> Iterator for Flatten<I>
+where
+    I: Iterator<Item = U>,
+{
+    type Item = U;
+}
+
+fn needs_iterator<I: Iterator>() {}
+
+fn environment<J>()
+where
+    J: Iterator,
+{
+    needs_iterator::<Flatten<J>>();
+}
+
+fn main() {}
-- 
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