gistfile1.rs

macro_rules! define_vec (
    ($vect: ident, $vecmod: ident, $compt: ty, $($components: ident)+) => (
        mod $vecmod {
            #[deriving(ToStr)]
            pub struct $vect { $($components : $compt),+ }

            impl $vect
            {
                #[inline(always)]
                pub fn new($($components: $compt),+) -> $vect { 
                    $vect{ $($components: $components),+ }
                }
            }
        }
    );
)

define_vec!(Vec3, vec3, f32, x y z)

fn main() {
    let a = vec3::Vec3::new(1.0, 0.0, 0.0);
    println(fmt!("%?, %?, %?", a.x, a.y, a.z));
}

gistfile2.txt

main.rs:4:23: 4:28 error: conflicting implementations for a trait
main.rs:4             #[deriving(ToStr)]
                                 ^~~~~
main.rs:4:23: 4:28 note: note conflicting implementation here
main.rs:4             #[deriving(ToStr)]
                                 ^~~~~
main.rs:4:23: 4:28 error: conflicting implementations for a trait
main.rs:4             #[deriving(ToStr)]
                                 ^~~~~
main.rs:4:23: 4:28 note: note conflicting implementation here
main.rs:4             #[deriving(ToStr)]
                                 ^~~~~
error: aborting due to 2 previous errors