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