diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f54a652
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rcrefcell"
+version = "0.1.0"
diff --git a/src/bin/notworking.rs b/src/bin/notworking.rs
new file mode 100644
index 0000000..63bcedd
--- /dev/null
+++ b/src/bin/notworking.rs
@@ -0,0 +1,24 @@
+fn c<F: FnOnce() + 'static>(f: F) {
+    f();
+}
+
+fn main() {
+    let v = vec![1, 2, 3];
+
+    c({
+        let mut v = v.clone();
+        move || {
+            println!("inner 1: {:?}", v);
+            v.push(4);
+        }
+    });
+    c({
+        let mut v = v.clone();
+        move || {
+            println!("inner 2: {:?}", v);
+            v.push(5);
+        }
+    });
+
+    println!("outer: {:?}", v);
+}
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index e7a11a9..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}