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, 37 insertions, 0 deletions

diff --git a/src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs b/src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs
new file mode 100644
index 000000000..61edd2ace
--- /dev/null
+++ b/src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs
@@ -0,0 +1,37 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(unused_variables)]
+// Test that we choose Deref or DerefMut appropriately based on mutability of ref bindings (#15609).
+
+fn main() {
+    use std::cell::RefCell;
+
+    struct S {
+        node: E,
+    }
+
+    enum E {
+        Foo(u32),
+        Bar,
+    }
+
+    // Check match
+    let x = RefCell::new(S { node: E::Foo(0) });
+
+    let mut b = x.borrow_mut();
+    match b.node {
+        E::Foo(ref mut n) => *n += 1,
+        _ => (),
+    }
+
+    // Check let
+    let x = RefCell::new(0);
+    let mut y = x.borrow_mut();
+    let ref mut z = *y;
+
+    fn foo(a: &mut RefCell<Option<String>>) {
+        if let Some(ref mut s) = *a.borrow_mut() {
+            s.push('a')
+        }
+    }
+}