#[rustfmt::skip]
fn main() {
let mut count = 0;
if cfg!(feature = "api-custom") { count += 1; }
if cfg!(feature = "api-4-1") { count += 1; }
if cfg!(feature = "api-4-1-1") { count += 1; }
if cfg!(feature = "api-4-1-2") { count += 1; }
if cfg!(feature = "api-4-1-3") { count += 1; }
if cfg!(feature = "api-4-1-4") { count += 1; }
if cfg!(feature = "api-4-2") { count += 1; }
if cfg!(feature = "api-4-2-1") { count += 1; }
if cfg!(feature = "api-4-2-2") { count += 1; }
if cfg!(feature = "api-4-3") { count += 1; }
assert!(count <= 1, "ERROR: at most one `api-*` feature can be enabled");
}