anchor.diff:      showFiles
       showOption
       unknownModule
  -    literalExpression
       ;
   
     showDeclPrefix = loc: decl: prefix:
  
positive.code:     recursiveUpdate
      reverseList sort
      setAttrByPath
      toList
      types
      warnIf
      zipAttrsWith
  
negative.code:                 }
                else
                  let
                    nonOptions = filter (m: !isOption m.options) decls;
                  in
                  throw "The option `${showOption loc}' in module `${(lib.head optionDecls)._file}' would be a parent of the following options, but its type `${(lib.head optionDecls).options.type.description or "<no description>"}' does not support nested options.\n${
  