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, 25 insertions, 0 deletions

diff --git a/src/test/ui/borrowck/borrowck-univariant-enum.rs b/src/test/ui/borrowck/borrowck-univariant-enum.rs
new file mode 100644
index 000000000..c78e94752
--- /dev/null
+++ b/src/test/ui/borrowck/borrowck-univariant-enum.rs
@@ -0,0 +1,25 @@
+// run-pass
+#![allow(non_camel_case_types)]
+
+use std::cell::Cell;
+
+#[derive(Copy, Clone)]
+enum newtype {
+    newvar(isize)
+}
+
+pub fn main() {
+
+    // Test that borrowck treats enums with a single variant
+    // specially.
+
+    let x = &Cell::new(5);
+    let y = &Cell::new(newtype::newvar(3));
+    let z = match y.get() {
+      newtype::newvar(b) => {
+        x.set(x.get() + 1);
+        x.get() * b
+      }
+    };
+    assert_eq!(z, 18);
+}