pub fn def_macro<T: Into<Option<ExpansionBody>>>(
cs: Token,
paramlist: Option<Parameters>,
expansion: T,
options_opt: Option<ExpandableOptions>,
) -> Result<()>Expand description
Defines the macro expansion for a command sequence.
A macro control sequence that reads parameters
as specified by paramlist and is expanded during macro expansion time in the Gullet.
See ExpansionBody for the possible kinds of expansion material.