Function parse_include 

pub fn parse_include(
    src_lines: &Vec<String>,
    doctree: DocTree,
    line_cursor: &mut LineCursor,
    first_indent: usize,
    body_indent: usize,
    empty_after_marker: bool,
    section_level: usize,
) -> TransitionResult

Parses in “include” directive for its argument and options. Generates an “include” node in the parse tree with the given options.