macro_rules! build {
    ($($case:ty),*) => { enum Test { $($case),* } };
}

fn main() {
    build!{ Foo(i32), Bar(i32, i32) };
}

macro_rules! build {
    ($($case:ty),*) => { enum Test { Foo(i32), Bar(i32, i32) } };
}

fn main() {
    build!{ Foo(i32), Bar(i32, i32) };
}

macro_rules! build {
    ($($case:ident),*) => { enum Test { $($case),* } };
}

fn main() {
    build!{ Foo, Bar };
}