macro_rules! type_from_lua_userdata{
	($asd:ident)=>{
		impl<'lua> mlua::FromLua<'lua> for $asd{
			fn from_lua(value:mlua::Value<'lua>,_lua:&'lua mlua::Lua)->Result<Self,mlua::Error>{
				match value{
					mlua::Value::UserData(ud)=>ud.take(),
					other=>Err(mlua::Error::runtime(format!("Expected {} got {:?}",stringify!($asd),other))),
				}
			}
		}
	};
}