texmath-0.6.7: tests/writers/mover-06.tex
\mathrm{-\ middle\ -}=\overset{\phantom{\mathrm{fail}}}{\overset{\phantom{\mathrm{fail}}}{\mathrm{-\ middle\ -}}}\mathrm{-\ middle\ -}=\overset{\phantom{\mathrm{fail}}}{\overset{\phantom{\mathrm{fail}}}{\mathrm{-\ middle\ -}}}