Macro impl_lossy_string_into_r 

macro_rules! impl_lossy_string_into_r {
    (
        $(#[$owned_meta:meta])*
        owned: $owned_ty:ty;
        $(#[$ref_meta:meta])*
        ref: $ref_ty:ty;
        $(#[$option_meta:meta])*
        option: $opt_ty:ty;
        $(#[$vec_meta:meta])*
        vec: $vec_ty:ty;
        $(#[$vec_option_meta:meta])*
        vec_option: $vec_opt_ty:ty;
    ) => { ... };
}

Generate IntoR impls for types with to_string_lossy() (owned scalar, ref scalar, Option, Vec, Vec). Used for PathBuf/&Path and OsString/&OsStr.