Macro thrift_struct

macro_rules! thrift_struct {
    ($(#[$($def_attrs:tt)*])* struct $identifier:ident { $($(#[$($field_attrs:tt)*])* $field_id:literal : $required_or_optional:ident $field_type:ident $(< $element_type:ident >)? $field_name:ident $(= $default_value:literal)? $(;)?)* }) => { ... };
}