Function rustc_resolve::rustdoc::source_span_for_markdown_range

pub fn source_span_for_markdown_range(
    tcx: TyCtxt<'_>,
    markdown: &str,
    md_range: &Range<usize>,
    fragments: &[DocFragment]
) -> Option<Span>

Attempts to match a range of bytes from parsed markdown to a Span in the source code.

This method will return None if we cannot construct a span from the source map or if the fragments are not all sugared doc comments. It’s difficult to calculate the correct span in that case due to escaping and other source features.