MysqlConnection doesn't work with r2d2-diesel

[kardeiz]

MysqlConnection can't be shared between threads, which makes it impossible to use in r2d2-diesel (or presumably any multi-thread environment). This is in diesel 0.11.0.

My code looks like:

fn connection_pool() -> ::err::Result<Pool> {
    let url = &::utils::config::CONFIG.db.url;
    let config = ::r2d2::Config::default();
    let manager = ConnectionManager::<MysqlConnection>::new(url);
    Ok(::r2d2::Pool::new(config, manager)?)
}

which fails to compile with (truncated):

within `diesel::mysql::connection::stmt::Statement`, 
  the trait `std::marker::Send` is not implemented for `*mut mysqlclient_sys::st_mysql_stmt`
note: `*mut mysqlclient_sys::st_mysql_stmt` cannot be sent between threads safely

I don't know if just adding unsafe impl Send for MysqlConnection {} would fix it (if might not be safe or even compile).

[kardeiz]

Cool, thanks!