Constant CLASS_DOC_LINES_MARKER 

pub const CLASS_DOC_LINES_MARKER: &str = ".__MX_CLASS_DOC_LINES__";

The line of ClassBlockEntry::head where the class’s roxygen block takes the ClassBlockEntry::class_doc_lines of every impl block of the type. Spelled the same as miniextendr_macros’s CLASS_DOC_LINES_MARKER.