Macro pgp::key_parser

macro_rules! key_parser {
    ( $key_type:ty, $key_type_parser: ident, $key_tag:expr, $inner_key_type:ty, $( ($subkey_tag:ident, $inner_subkey_type:ty, $subkey_type:ty, $subkey_container:ident) ),* ) => { ... };
}

This macro generates the parsers matching to the two different types of keys, public and secret.