ntex-rt 3.17.2

ntex runtime
Documentation 
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use std::{collections::HashSet, env};

fn main() {
    let mut features = HashSet::<&'static str>::default();

    for (key, _) in env::vars() {
        let _ = match key.as_ref() {
            "CARGO_FEATURE_COMPIO" => features.insert("compio"),
            "CARGO_FEATURE_TOKIO" => features.insert("tokio"),
            _ => false,
        };
    }

    if features.len() > 1 {
        panic!("Only one runtime feature could be selected, current selection {features:?}");
    }
}