The LaTeX package gobble includes several gobble macros not included in the LaTeX kernel. These macros remove a number of arguments after them, a feature regulary used inside other macros. This includes gobble macros for optional arguments. The LaTeX package gobble-user provides these macros at the user level, i.e. using names without @ so that these can be used without \makeatletter and \makeatother. The same macros are provided inside .tex files for use with plain-TeX or other TeX formats. However, the gobble macros for optional macros require \@ifnextchar to be defined.