Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/library/core/tests/pin.rs b/library/core/tests/pin.rs
new file mode 100644
index 000000000..6f617c8d0
--- /dev/null
+++ b/library/core/tests/pin.rs
@@ -0,0 +1,31 @@
+use core::pin::Pin;
+
+#[test]
+fn pin_const() {
+    // test that the methods of `Pin` are usable in a const context
+
+    const POINTER: &'static usize = &2;
+
+    const PINNED: Pin<&'static usize> = Pin::new(POINTER);
+    const PINNED_UNCHECKED: Pin<&'static usize> = unsafe { Pin::new_unchecked(POINTER) };
+    assert_eq!(PINNED_UNCHECKED, PINNED);
+
+    const INNER: &'static usize = Pin::into_inner(PINNED);
+    assert_eq!(INNER, POINTER);
+
+    const INNER_UNCHECKED: &'static usize = unsafe { Pin::into_inner_unchecked(PINNED) };
+    assert_eq!(INNER_UNCHECKED, POINTER);
+
+    const REF: &'static usize = PINNED.get_ref();
+    assert_eq!(REF, POINTER);
+
+    // Note: `pin_mut_const` tests that the methods of `Pin<&mut T>` are usable in a const context.
+    // A const fn is used because `&mut` is not (yet) usable in constants.
+    const fn pin_mut_const() {
+        let _ = Pin::new(&mut 2).into_ref();
+        let _ = Pin::new(&mut 2).get_mut();
+        let _ = unsafe { Pin::new(&mut 2).get_unchecked_mut() };
+    }
+
+    pin_mut_const();
+}