As noted in Bug 1692 comment 5, smallvectors fails in C++03 mode since these commits (in default and 3.3):
Perhaps we can let `is_valid_index_type` check explicitly for common non-integral types like float/double/complex<*>.
Or we just disable the test in C++03 mode.
-- GitLab Migration Automatic Message --
This bug has been migrated to gitlab.com's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.com/libeigen/eigen/issues/1711.