1 files changed, 10 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-42106.rs b/tests/ui/issues/issue-42106.rs
new file mode 100644
index 00000000000..5e688693bf9
--- /dev/null
+++ b/tests/ui/issues/issue-42106.rs
@@ -0,0 +1,10 @@
+fn do_something<T>(collection: &mut Vec<T>) {
+    let _a = &collection;
+    collection.swap(1, 2); //~ ERROR also borrowed as immutable
+    _a.use_ref();
+}
+
+fn main() { }
+
+trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
+impl<T> Fake for T { }