Function protobuf::reflect::accessor::make_simple_field_accessor

pub fn make_simple_field_accessor<M, V>(name: &'static str,
                                        get_field: fn<'a>(_: &'a M) -> &'a V::Value,
                                        mut_field: fn<'a>(_: &'a mut M) -> &'a mut V::Value)
                                        -> Box<FieldAccessor + 'static> where M: Message + 'static, V: ProtobufType + 'static