Macro asn1_cereal::ber_alias

macro_rules! ber_alias {
    ($outer:ident ::= [$($args:tt)*] $inner:ty, $asn1_ty:expr) => { ... };
    ($outer:ident ::= $inner:ty, $asn1_ty:expr) => { ... };
}

Generate the implemention of an ASN.1 alias for a Rust type.