1 files changed, 49 insertions, 0 deletions
diff --git a/tests/ui/borrowck/kindck-implicit-close-over-mut-var.rs b/tests/ui/borrowck/kindck-implicit-close-over-mut-var.rs
new file mode 100644
index 000000000..5b5d86eec
--- /dev/null
+++ b/tests/ui/borrowck/kindck-implicit-close-over-mut-var.rs
@@ -0,0 +1,49 @@
+// run-pass
+
+#![allow(unused_must_use)]
+#![allow(dead_code)]
+use std::thread;
+
+fn user(_i: isize) {}
+
+fn foo() {
+    // Here, i is *copied* into the proc (heap closure).
+    // Requires allocation.  The proc's copy is not mutable.
+    let mut i = 0;
+    let t = thread::spawn(move|| {
+        user(i);
+        println!("spawned {}", i)
+    });
+    i += 1;
+    println!("original {}", i);
+    t.join();
+}
+
+fn bar() {
+    // Here, the original i has not been moved, only copied, so is still
+    // mutable outside of the proc.
+    let mut i = 0;
+    while i < 10 {
+        let t = thread::spawn(move|| {
+            user(i);
+        });
+        i += 1;
+        t.join();
+    }
+}
+
+fn car() {
+    // Here, i must be shadowed in the proc to be mutable.
+    let mut i = 0;
+    while i < 10 {
+        let t = thread::spawn(move|| {
+            let mut i = i;
+            i += 1;
+            user(i);
+        });
+        i += 1;
+        t.join();
+    }
+}
+
+pub fn main() {}