/// Contains data for specific types of import directives.
#[derive(Clone, Debug)]
pub enum ImportDirectiveSubclass<'a> {
    SingleImport {
        target: Ident,
        source: Ident,
        result: PerNS<Cell<Result<&'a NameBinding<'a>, Determinacy>>>,
        type_ns_only: bool,
    },
    GlobImport {
        is_prelude: bool,
        max_vis: Cell<ty::Visibility>, // The visibility of the greatest reexport.
        // n.b. `max_vis` is only used in `finalize_import` to check for reexport errors.
    },
    ExternCrate(Option<Name>),
    MacroUse,
}

/// Contains data for specific types of import directives.
#[derive(Clone, Debug)]
pub enum ImportDirectiveSubclass<'a> {
    SingleImport {
        target: Ident,
        source: Ident,
        result: PerNS<Cell<Result<&'a NameBinding<'a>, Determinacy>>>,
        type_ns_only: bool,
    },
    GlobImport {
        is_prelude: bool,
        max_vis: Cell<ty::Visibility>, // The visibility of the greatest reexport.
                                       // n.b. `max_vis` is only used in `finalize_import` to check for reexport errors.
    },
    ExternCrate(Option<Name>),
    MacroUse,
}