1 files changed, 11 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/src/main.rs b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/src/main.rs
new file mode 100644
index 000000000..0da04c010
--- /dev/null
+++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/src/main.rs
@@ -0,0 +1,11 @@
+fn main() {
+    // ANCHOR: here
+    let mut s = String::from("hello");
+
+    let r1 = &s; // no problem
+    let r2 = &s; // no problem
+    let r3 = &mut s; // BIG PROBLEM
+
+    println!("{}, {}, and {}", r1, r2, r3);
+    // ANCHOR_END: here
+}