Issue 84163
Summary Capture of `*this` in explicit object parameter lambda doesn't respect qualifiers
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Reporter wreien
    ```cpp
struct S {
  int x;

  auto foo() {
    return [*this](this auto&&) {
      __builtin_printf("%d ", x);
      x = 10;
    };
  }
};

int main() {
  S s{ 5 };
  const auto l = s.foo();
  l();
  s.x = 15;
  l();
 __builtin_printf("%d\n", s.x);
}
```
https://godbolt.org/z/35qjr473K

Expected: an error that you cannot modify `x` within a `const` lambda.

Result: Prints `5 10 15`, demonstrating both that `l` has captured a copy of `S`, and also that (despite being a `const` object) it is nevertheless mutating its own state.
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