fn parse_assignments<'a, MS: STeXModuleStore, Err: FnMut(String, SourceRange<LSPLineCol>, DiagnosticLevel)>(
p: &mut LaTeXParser<'a, ParseStr<'a, LSPLineCol>, STeXToken<LSPLineCol>, Err, STeXParseState<'a, LSPLineCol, MS>>,
m: &mut Macro<'a, LSPLineCol, &'a str>,
) -> Option<(Vec<InlineMorphAssign<LSPLineCol, STeXToken<LSPLineCol>>>, VecMap<SymbolReference<LSPLineCol>, MorphismSpec<LSPLineCol>>)>