diff --git a/andthenchaintest/Cargo.lock b/andthenchaintest/Cargo.lock
new file mode 100644
index 0000000..5faf678
--- /dev/null
+++ b/andthenchaintest/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "andthenchaintest"
+version = "0.1.0"
diff --git a/andthenchaintest/Cargo.toml b/andthenchaintest/Cargo.toml
new file mode 100644
index 0000000..ea4358f
--- /dev/null
+++ b/andthenchaintest/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "andthenchaintest"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/andthenchaintest/src/main.rs b/andthenchaintest/src/main.rs
new file mode 100644
index 0000000..2d17f0b
--- /dev/null
+++ b/andthenchaintest/src/main.rs
@@ -0,0 +1,10 @@
+fn main() {
+    let value: Result<u32, u32> = Err(20)
+        .map_err(|_: u32| 30)
+        .and_then(|_old: u32| Err(40));
+
+    // Note: Order does not affect these results; even if `.map_err()` comes before `.and_then()`,
+    // when `.and_then()` returns an error, it is captured by `.map_err()` again.
+
+    println!("{:?}", value);
+}