texmath-0.6.7: tests/writers/mfracZcomp-04.tex
\mathrm{Inline,\ auto,\ thick\ line~}\frac{{{x}}^{2}+1}{{x}} \mathrm{,\ the\ superscripted\ 2\ should\ be\ script-script\ size.}\mathrm{Inline,\ auto,\ thick\ line~}\frac{{{x}}^{2}+1}{{x}} \mathrm{,\ the\ superscripted\ 2\ should\ be\ script-script\ size.}