1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/borrowck/promote-ref-mut-in-let-issue-46557.rs b/tests/ui/borrowck/promote-ref-mut-in-let-issue-46557.rs
new file mode 100644
index 00000000000..3576734de3c
--- /dev/null
+++ b/tests/ui/borrowck/promote-ref-mut-in-let-issue-46557.rs
@@ -0,0 +1,31 @@
+// Test that we fail to promote the constant here which has a `ref
+// mut` borrow.
+
+fn gimme_static_mut_let() -> &'static mut u32 {
+    let ref mut x = 1234543;
+    x //~ ERROR
+}
+
+fn gimme_static_mut_let_nested() -> &'static mut u32 {
+    let (ref mut x, ) = (1234543, );
+    x //~ ERROR
+}
+
+fn gimme_static_mut_match() -> &'static mut u32 {
+    match 1234543 { //~ ERROR
+        ref mut x => x
+    }
+}
+
+fn gimme_static_mut_match_nested() -> &'static mut u32 {
+    match (123443,) { //~ ERROR
+        (ref mut x,) => x,
+    }
+}
+
+fn gimme_static_mut_ampersand() -> &'static mut u32 {
+    &mut 1234543 //~ ERROR
+}
+
+fn main() {
+}