diff --git a/cflow.rs b/cflow.rs
new file mode 100644
index 0000000..a619c8c
--- /dev/null
+++ b/cflow.rs
@@ -0,0 +1,35 @@
+//! Testing ControlFlow
+
+use std::ops::ControlFlow;
+
+#[derive(Debug)]
+enum ValueError {
+    Odd,
+    Zero,
+}
+
+fn main() {
+    let invalid = [1, 3, 4, 0, 2, 4, 1];
+    let all_valid = [2, 2, 2, 2, 4];
+
+    let res_invalid = process(&invalid);
+    println!("Invalid: {:?}", res_invalid);
+}
+
+fn process(values: &[u8]) -> Result<Vec<u8>, ValueError> {
+    let result = values
+        .iter()
+        .map(|x| {
+            if *x == 0 {
+                ControlFlow::Break(Err(ValueError::Zero))
+                // or `return Err(ValueError::Zero)`
+            } else if *x % 2 != 0 {
+                ControlFlow::Break(Err(ValueError::Odd))
+                // or `return Err(ValueError::Odd)`
+            } else {
+                ControlFlow::Continue(*x * 2)
+            }
+        })
+        .collect::<Vec<u8>>();
+    Ok(result)
+}