pub fn check_oml(_doc: &Doc) -> WriteReportExpand description
Report what writing OML would adjust, without producing output. Added
for issue #31 (the format registry): OML is lossless for every
Document (see this module’s doc comment), so there is never anything
to report – mirrors Python’s check_oml, which is exactly return WriteReport(). Every other builtin format has a check_* function
already; this is the OML counterpart, needed so the "oml" registry
entry has a check callable like the other four.