1 files changed, 25 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-18566.rs b/tests/ui/issues/issue-18566.rs
new file mode 100644
index 00000000000..9da904acf1f
--- /dev/null
+++ b/tests/ui/issues/issue-18566.rs
@@ -0,0 +1,25 @@
+use std::ops::Deref;
+
+struct MyPtr<'a>(&'a mut usize);
+impl<'a> Deref for MyPtr<'a> {
+    type Target = usize;
+
+    fn deref<'b>(&'b self) -> &'b usize { self.0 }
+}
+
+trait Tr {
+    fn poke(&self, s: &mut usize);
+}
+
+impl Tr for usize {
+    fn poke(&self, s: &mut usize)  {
+        *s = 2;
+    }
+}
+
+fn main() {
+    let s = &mut 1;
+
+    MyPtr(s).poke(s);
+    //~^ ERROR cannot borrow `*s` as mutable more than once at a time
+}