getlocvar
getlocvar(fs, b.u.info)->startpc = fs->pc;
getlocvar(fs, fs->nactvar - nvars)->startpc = fs->pc;
getlocvar(fs, --fs->nactvar)->endpc = fs->pc;
if (luaS_eqstr(n, getlocvar(fs, i)->varname))
TString *vname = getlocvar(fs, gt->nactvar)->varname;