# Pietro Albini - Shipping a Compiler Every Six Weeks (Highlights)  ## Highlights - we have no pres­sure to ship things. - how can we actu­ally prevent regres­sions from reach­ing the stable chan­nel? - the first answer is the compil­er’s test suite - Why don’t we test our users’ code ourselves? This is an idea that seems really bad and seems to waste a lot of money but it actu­ally works and it’s Crater. - For each project we run cargo test two times, once with stable and one with beta, and if cargo test runs on stable but fails on beta then that’s a regres­sion, and we get a nice colour­ful report where we can inspect.