False positive unusedPrivateFunction when using trailing return type while overriding a virtual function

[Frank]

I get a possible false positive warning when using trailing return type while overriding a virtual function.

warning: Unused private function: 'Test::PrivateTest' [unusedPrivateFunction]

#ifndef TEST_H
#define TEST_H

class BaseTest {
public:  
  virtual auto Testing() -> void = 0;
};

class Test final : public BaseTest {
private:
  auto PrivateTest() -> void;
public:
  auto Testing() -> void override;
};

#endif // TEST_H

auto Test::PrivateTest() -> void {
  return;
}

auto Test::Testing() -> void {
  PrivateTest();
}

When I don't use trailing return type in the public function definition, I don't get any warning.
Also no warning when removing the override.

[CHR]

Thanks for reporting, ticket is here: https://trac.cppcheck.net/ticket/12619