macro_rules! indices {
    ([] $($rest:tt)*) =>
      { indices!($($rest)* []) };
    ([$x1:tt] $($rest:tt)*) =>
      { indices!($($rest)* [0]) };
    ([$x1:tt $x2:tt] $($rest:tt)*) =>
      { indices!($($rest)* [0 1]) };
    ([$x1:tt $x2:tt $x3:tt] $($rest:tt)*) =>
      { indices!($($rest)* [0 1 2]) };
      // etc
    ($cb:ident: $($args:tt)*) =>
      { $cb!( $($args)* ) };
}
macro_rules! defer {
    ($c:expr, $i:ident( $( $x:expr ),* )) => {{
        indices!([$(($x))*] defer_aux: $c, $i $( , $x )*; );
    }}
}
macro_rules! defer_aux {
    ($c:expr, $i:ident $(, $x:expr )*; [$( $xi:tt )*]) => {{
        let tup = ( $( $x, )* );
        $c.defer(move |c| $i(c $(, tup . $xi)*));
    }}
}
struct Core {}
impl Core {
    fn defer<F>(&mut self, _f: F) where F: FnOnce(&mut Core) + 'static {}
}
fn test(_core: &mut Core, _v1: i32, _v2: i32) {}
fn main() {
    let mut core = Core {};
    defer!(&mut core, test(1, 2));
}