use std::env;
fn main() {
let log = env::var("CARGO_FEATURE_LOG").is_ok();
let tracing = env::var("CARGO_FEATURE_TRACING").is_ok();
if log && tracing {
println!("cargo:warning=Both `log` and `tracing` features are enabled. Only one should be active, as one deactivates the other (so neither logging nor tracing is enabled).");
}
}