A dangling reference is easy to miss on your laptop and hard to ignore on a container that behaves differently. Free AI tools can generate the first bug and then help you find it, if you know how to verify their output. This article walks through a real failure: an AI-generated C++ function returned a reference to a local variable. Local tests passed. Then the same code crashed on a remote free server. The fix came from a combination of free model iteration, a free server environment, and the...