Imagine a program with a compile error, nicely wrapped into reproducible build system (like a docker with tools or nix). It is deterministic - compilation fail

Imagine a program with a compile error, nicely wrapped into reproducible build system (like a docker with tools or nix). It is deterministic - compilation fails at the same line every time. It is fully reproducible - anyone can get the same compilation error. And yet it is not reliable at all, it's completely broken.