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, 20 insertions, 0 deletions

diff --git a/src/test/ui/regions/regions-ret-borrowed.rs b/src/test/ui/regions/regions-ret-borrowed.rs
new file mode 100644
index 000000000..bdb0341c9
--- /dev/null
+++ b/src/test/ui/regions/regions-ret-borrowed.rs
@@ -0,0 +1,20 @@
+// Ensure that you cannot use generic types to return a region outside
+// of its bound.  Here, in the `return_it()` fn, we call with() but
+// with R bound to &isize from the return_it.  Meanwhile, with()
+// provides a value that is only good within its own stack frame. This
+// used to successfully compile because we failed to account for the
+// fact that fn(x: &isize) rebound the region &.
+
+fn with<R, F>(f: F) -> R where F: FnOnce(&isize) -> R {
+    f(&3)
+}
+
+fn return_it<'a>() -> &'a isize {
+    with(|o| o)
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() {
+    let x = return_it();
+    println!("foo={}", *x);
+}