Function is_value

python3-sys/build.rs:155–157

(key: &str)

}

fn is_value(key: &str) -> bool {
    SYSCONFIG_VALUES.iter().any(|x| *x == key)
}

fn cfg_line_for_var(key: &str, val: &str) -> Option<String> {
    if is_value(key) {