pub fn ifpdfprimitive<ET: EngineTypes>(
engine: &mut EngineReferences<'_, ET>,
_tk: ET::Token,
) -> TeXResult<bool, ET>pub fn ifpdfprimitive<ET: EngineTypes>(
engine: &mut EngineReferences<'_, ET>,
_tk: ET::Token,
) -> TeXResult<bool, ET>