Function do_paragraph

fn do_paragraph<'a, MS: STeXModuleStore, Err: FnMut(String, SourceRange<LSPLineCol>, DiagnosticLevel)>(
    kind: ParagraphKind,
    p: &mut LaTeXParser<'a, ParseStr<'a, LSPLineCol>, STeXToken<LSPLineCol>, Err, STeXParseState<'a, LSPLineCol, MS>>,
    range: SourceRange<LSPLineCol>,
    open_group: bool,
) -> (Option<SymbolReference<LSPLineCol>>, Vec<ParagraphArg<LSPLineCol, STeXToken<LSPLineCol>>>)