Function assign

pub fn assign<'a, MS: STeXModuleStore, Err: FnMut(String, SourceRange<LSPLineCol>, DiagnosticLevel)>(
    assign: Macro<'a, LSPLineCol, &'a str>,
    p: &mut LaTeXParser<'a, ParseStr<'a, LSPLineCol>, STeXToken<LSPLineCol>, Err, STeXParseState<'a, LSPLineCol, MS>>,
) -> MacroResult<'a, LSPLineCol, &'a str, STeXToken<LSPLineCol>>