usestd::path::Path;/// return true if `path` is absolute, which depends on the platform but is always true if it starts with a `slash`, hence looks like
/// a linux path.
pubfnis_absolute(path: impl AsRef<Path>)->bool{let path = path.as_ref();
path.is_absolute()|| path.to_str().and_then(|s|s.chars().next())==Some('/')}