texmath-0.6.7: tests/writers/mover-03.tex
\overset{\genfrac{}{}{0.0mm}{}{\mathrm{first}}{\mathrm{second}} }{\mathrm{BASE}}=\overset{\phantom{\mathrm{over}}}{\overset{\genfrac{}{}{0.0mm}{}{\mathrm{first}}{\mathrm{second}} }{\mathrm{BASE}}}\overset{\genfrac{}{}{0.0mm}{}{\mathrm{first}}{\mathrm{second}} }{\mathrm{BASE}}=\overset{\phantom{\mathrm{over}}}{\overset{\genfrac{}{}{0.0mm}{}{\mathrm{first}}{\mathrm{second}} }{\mathrm{BASE}}}