This is related to libvroom.

If I have a location created using an index

auto lhs = vroom::Location(1);

and a location created using coordinates

auto rhs = vroom::Location(vroom::Coordinates{10, 11});

I would expect the below to pass

assert(!(lhs == rhs));

but this is not always the case. The comparison code checks presence of index only on left hand side object and assumes the right hand side object to have index as well. This reads to reading from an uninitialised member variable, which is undefined behaviour.

If I flip the arguments

assert(!(rhs == lhs));

the bug is bypassed and result is correct.