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modules/systems/pc.cc: In member function 'Optional<SI::Speed> PerformanceComputer::get_stall_ias(const SI::Angle&) const':
modules/systems/pc.cc:353:11: error: could not convert 'nullptr' from 'std::nullptr_t' to 'Optional<SI::Speed> {aka boost::optional<SI::Speed>}'
    return nullptr;
           ^
modules/systems/pc.cc:356:10: error: could not convert 'nullptr' from 'std::nullptr_t' to 'Optional<SI::Speed> {aka boost::optional<SI::Speed>}'
   return nullptr;
          ^
modules/systems/pc.cc: In member function 'Optional<SI::Speed> PerformanceComputer::tas_to_ias(const SI::Speed&) const':
modules/systems/pc.cc:372:10: error: could not convert 'nullptr' from 'std::nullptr_t' to 'Optional<SI::Speed> {aka boost::optional<SI::Speed>}'
   return nullptr;