Merging upstream version 1.68.2+dfsg1.

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

1 files changed, 0 insertions, 36 deletions

diff --git a/src/test/ui/codegen/issue-63787.rs b/src/test/ui/codegen/issue-63787.rs
deleted file mode 100644
index cba079b23..000000000
--- a/src/test/ui/codegen/issue-63787.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-// run-pass
-// compile-flags: -O
-
-// Make sure that `Ref` and `RefMut` do not make false promises about aliasing,
-// because once they drop, their reference/pointer can alias other writes.
-
-// Adapted from comex's proof of concept:
-// https://github.com/rust-lang/rust/issues/63787#issuecomment-523588164
-
-use std::cell::RefCell;
-use std::ops::Deref;
-
-pub fn break_if_r_is_noalias(rc: &RefCell<i32>, r: impl Deref<Target = i32>) -> i32 {
-    let ptr1 = &*r as *const i32;
-    let a = *r;
-    drop(r);
-    *rc.borrow_mut() = 2;
-    let r2 = rc.borrow();
-    let ptr2 = &*r2 as *const i32;
-    if ptr2 != ptr1 {
-        panic!();
-    }
-    // If LLVM knows the pointers are the same, and if `r` was `noalias`,
-    // then it may replace this with `a + a`, ignoring the earlier write.
-    a + *r2
-}
-
-fn main() {
-    let mut rc = RefCell::new(1);
-    let res = break_if_r_is_noalias(&rc, rc.borrow());
-    assert_eq!(res, 3);
-
-    *rc.get_mut() = 1;
-    let res = break_if_r_is_noalias(&rc, rc.borrow_mut());
-    assert_eq!(res, 3);
-}