texmath-0.13.2: test/writer/starmath/071_grouped_mathrm_alpha_subscripts_stay_structural.test
<<< tex
n_{\mathrm{Fe_{bcc}}} + n_{\mathrm{Fe_{fcc}}}
>>> starmath
n_{nitalic{Fe_bcc}} + n_{nitalic{Fe_fcc}}
<<< tex
n_{\mathrm{Fe_{bcc}}} + n_{\mathrm{Fe_{fcc}}}
>>> starmath
n_{nitalic{Fe_bcc}} + n_{nitalic{Fe_fcc}}