gistfile1.rs

fn add<T: Add<T, T>>( 
        a: proc() -> T,  
        b: proc() -> T 
) -> proc() -> T { 
        proc() a() + b() 
} 
 
fn main() { 
        let a = proc() 2; 
        let b = proc() 3; 
        let c = add(a, b); 
        let d = c(); 
        println!("{}", d); 
        let e = c(); 
        println!("{}", e); 
} 

Compiler error:

/home/sven/Desktop/prob/src/closure/main.rs:15:9: 15:10 error: use of moved value: `c`
/home/sven/Desktop/prob/src/closure/main.rs:15 	let e = c();
                                               	        ^
/home/sven/Desktop/prob/src/closure/main.rs:13:9: 13:10 note: `c` moved here because it has type `proc:Send() -> int`, which is non-copyable (perhaps you meant to use clone()?)
/home/sven/Desktop/prob/src/closure/main.rs:13 	let d = c();
                                               	        ^
error: aborting due to previous error
task '<unnamed>' failed at 'explicit failure', /home/sven/Desktop/rust/src/libsyntax/diagnostic.rs:102
task '<unnamed>' failed at 'receiving on a closed channel', /home/sven/Desktop/rust/src/libstd/comm/mod.rs:728