use crate::Trust; impl Trust {    /// Derive `Full` trust if `path` is owned by the user executing the current process, or `Reduced` trust otherwise.    pub fn from_path_ownership(path: impl AsRef<std::path::Path>) -> std::io::Result<Self> {        Ok(if crate::identity::is_path_owned_by_current_user(path.as_ref())? {            Trust::Full        } else {            Trust::Reduced        })    }} /// A trait to help creating default values based on a trust level.pub trait DefaultForLevel {    /// Produce a default value for the given trust `level`.    fn default_for_level(level: Trust) -> Self;} /// Associate instructions for how to deal with various `Trust` levels as they are encountered in the wild.pub struct Mapping<T> {    /// The value for fully trusted resources.    pub full: T,    /// The value for resources with reduced trust.    pub reduced: T,} impl<T> Default for Mapping<T>where    T: DefaultForLevel,{    fn default() -> Self {        Mapping {            full: T::default_for_level(Trust::Full),            reduced: T::default_for_level(Trust::Reduced),        }    }} impl<T> Mapping<T> {    /// Obtain the value for the given trust `level`.    pub fn by_level(&self, level: Trust) -> &T {        match level {            Trust::Full => &self.full,            Trust::Reduced => &self.reduced,        }    }     /// Obtain the value for the given `level` once.    pub fn into_value_by_level(self, level: Trust) -> T {        match level {            Trust::Full => self.full,            Trust::Reduced => self.reduced,        }    }}