Using prepared fails sometimes with "Acquiring waiter that is already in use " #153
Description
Sometimes when using a lot of prepared statements it will fail with "Acquiring waiter that is already in use" from down in "libasync", which causes the application to crash with an "AssertError".
I'm using vibe.d and MySQLPool and to retrieve a connection I use "lockConnection()" which I pass to "prepare":
Example:
auto connection = pool.lockConnection();
auto prepared = prepare(connection, sql);