upright_identifier_boundaries.test

<<< tex
\mathrm d n+\mathrm d n_i+\mathrm d n^2+\mathrm d 2+\mathrm d\alpha+\mathrm d+\mathrm{dt}+\frac{\mathrm d}{t}
>>> starmath
nitalic d n + nitalic d n_i + nitalic d n^2 + nitalic d 2 + nitalic d %ialpha + nitalic d + "dt" + {nitalic d over t}