tree df01ac1e4cf33999f44db55e0851eda686731353
parent d7d68f059e6bf5b795961482b3047a7c675e998a
author Marcel Hlopko <hlopko@google.com> 1653641276 -0700
committer Copybara-Service <copybara-worker@google.com> 1653641304 -0700

Do not import abstract classes

Right now Crubit generates C++ thunks for instantiating a type, for example:

```
extern "C" void __rust_thunk___Foo1234_(class Foo* __this,
                                        const class Foo& __param_0) {
  crubit::construct_at(std::forward<decltype(__this)>(__this),
                       std::forward<decltype(__param_0)>(__param_0));
}
```

Abstract classes cannot be instantiated (`error: allocating an object of abstract class type`). Instead of fixing that I decided (since it's currently higher priority for me to fix crashes and false positives than increasing coverage) to temporarily disable generating bindings for abstract classes (classes having a pure virtual method).

This CL does not touch non-abstract classes, with or without virtual methods.

PiperOrigin-RevId: 451336767