From 1a54144349cf461e6cb6767607e90cc7e73a6e1c Mon Sep 17 00:00:00 2001
From: Ali MJ Al-Nasrawy <alimjalnasrawy@gmail.com>
Date: Fri, 31 Mar 2023 03:27:51 +0000
Subject: [PATCH] add test for normalization in implied bounds query

See https://github.com/rust-lang/rust/issues/109799.
---
 .../normalization-nested.lifetime.stderr      | 18 +++++++++
 .../ui/implied-bounds/normalization-nested.rs | 39 +++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 tests/ui/implied-bounds/normalization-nested.lifetime.stderr
 create mode 100644 tests/ui/implied-bounds/normalization-nested.rs

diff --git a/tests/ui/implied-bounds/normalization-nested.lifetime.stderr b/tests/ui/implied-bounds/normalization-nested.lifetime.stderr
new file mode 100644
index 00000000000..898e5e9511e
--- /dev/null
+++ b/tests/ui/implied-bounds/normalization-nested.lifetime.stderr
@@ -0,0 +1,18 @@
+error[E0759]: `fn` parameter has lifetime `'x` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/normalization-nested.rs:35:20
+   |
+LL | pub fn test<'x>(_: Map<Vec<&'x ()>>, s: &'x str) -> &'static str {
+   |                    ^^^^^^^^^^^^^^^^
+   |                    |
+   |                    this data with lifetime `'x`...
+   |                    ...is used and required to live as long as `'static` here
+   |
+note: `'static` lifetime requirement introduced by this bound
+  --> $DIR/normalization-nested.rs:33:14
+   |
+LL |     I::Item: 'static;
+   |              ^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0759`.
diff --git a/tests/ui/implied-bounds/normalization-nested.rs b/tests/ui/implied-bounds/normalization-nested.rs
new file mode 100644
index 00000000000..5f1cbb3f697
--- /dev/null
+++ b/tests/ui/implied-bounds/normalization-nested.rs
@@ -0,0 +1,39 @@
+// Test for normalization of projections that appear in the item bounds
+// (versus those that appear directly in the input types).
+// Both revisions should pass. `lifetime` revision is a bug.
+//
+// revisions: param_ty lifetime
+// [param_ty] check-pass
+// [lifetime] check-fail
+// [lifetime] known-bug: #109799
+
+pub trait Iter {
+    type Item;
+}
+
+#[cfg(param_ty)]
+impl<X, I> Iter for I
+where
+    I: IntoIterator<Item = X>,
+{
+    type Item = X;
+}
+
+#[cfg(lifetime)]
+impl<'x, I> Iter for I
+where
+    I: IntoIterator<Item = &'x ()>,
+{
+    type Item = &'x ();
+}
+
+pub struct Map<I>(I)
+where
+    I: Iter,
+    I::Item: 'static;
+
+pub fn test<'x>(_: Map<Vec<&'x ()>>, s: &'x str) -> &'static str {
+    s
+}
+
+fn main() {}