Rollup merge of #143302 - Kivooeo:tf27, r=tgross35

`tests/ui`: A New Order [27/N]

> [!NOTE]
>
> Intermediate commits are intended to help review, but will be squashed prior to merge.

Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.

r? ``@tgross35``

1 files changed, 37 insertions, 0 deletions

diff --git a/tests/ui/lifetimes/any-lifetime-escape-higher-rank.rs b/tests/ui/lifetimes/any-lifetime-escape-higher-rank.rs
new file mode 100644
index 00000000000..f9f38ee532d
--- /dev/null
+++ b/tests/ui/lifetimes/any-lifetime-escape-higher-rank.rs
@@ -0,0 +1,37 @@
+//! Checks that `std::any::Any` cannot be used to circumvent lifetime rules
+//! with higher-rank types.
+
+//@ run-pass
+
+use std::any::Any;
+
+struct Foo<'a>(&'a str);
+
+fn good(s: &String) -> Foo<'_> {
+    Foo(s)
+}
+
+fn bad1(s: String) -> Option<&'static str> {
+    let a: Box<dyn Any> = Box::new(good as fn(&String) -> Foo);
+    a.downcast_ref::<fn(&String) -> Foo<'static>>().map(|f| f(&s).0)
+}
+
+trait AsStr<'a, 'b> {
+    fn get(&'a self) -> &'b str;
+}
+
+impl<'a> AsStr<'a, 'a> for String {
+    fn get(&'a self) -> &'a str {
+        self
+    }
+}
+
+fn bad2(s: String) -> Option<&'static str> {
+    let a: Box<dyn Any> = Box::new(Box::new(s) as Box<dyn for<'a> AsStr<'a, 'a>>);
+    a.downcast_ref::<Box<dyn for<'a> AsStr<'a, 'static>>>().map(|x| x.get())
+}
+
+fn main() {
+    assert_eq!(bad1(String::from("foo")), None);
+    assert_eq!(bad2(String::from("bar")), None);
+}