texmath-0.6.7: tests/writers/munder-08.tex
\underset{\mathrm{under\ script}}{\mathrm{\_\ \ baseline\ \_\ }}=\underset{\mathrm{under\ script}}{\overset{\phantom{\mathrm{fail}}}{\mathrm{\_\ \ baseline\ \_\ }}}\underset{\mathrm{under\ script}}{\mathrm{\_\ \ baseline\ \_\ }}=\underset{\mathrm{under\ script}}{\overset{\phantom{\mathrm{fail}}}{\mathrm{\_\ \ baseline\ \_\ }}}