As noted in Bug 1692 comment 5, smallvectors fails in C++03 mode since these commits (in default and 3.3): https://bitbucket.org/eigen/eigen/commits/b31bfdc8c https://bitbucket.org/eigen/eigen/commits/1ed149473 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.
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