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src/structs/tuple-structs.md

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+# Tuple Structs
+
+If the field names are unimportant, you can use a tuple struct:
+
+```rust,editable
+struct Point(i32, i32);
+
+fn main() {
+    let p = Point(17, 23);
+    println!("({}, {})", p.0, p.1);
+}
+```
+
+This is often used for single-field wrappers (called newtypes):
+
+```rust,editable,compile_fail
+struct PoundOfForce(f64);
+struct Newtons(f64);
+
+fn compute_thruster_force() -> PoundOfForce {
+    todo!("Ask a rocket scientist at NASA")
+}
+
+fn set_thruster_force(force: Newtons) {
+    // ...
+}
+
+fn main() {
+    let force = compute_thruster_force();
+    set_thruster_force(force);
+}
+
+```