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Task/Currying/Rust/currying.rust

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+#![feature(box_syntax)]
+fn add_n(n : i32) -> Box<Fn(i32) -> i32 + 'static>  {
+    box move |&: x| n + x
+}
+
+fn main() {
+    let adder = add_n(40);
+    println!("The answer to life is {}.", adder(2));
+}