.map(replacedAccessor -> {
                AccessorKey key = AccessorKey.ofReplacedAccessor(upgradedProperty.getContainingType(), replacedAccessor);
                return new AbstractMap.SimpleEntry<>(key, replacedAccessor);
            });
    }

    private static <T> Map<AccessorKey, T> diff(Map<AccessorKey, T> first, Map<AccessorKey, T> second) {
        return first.entrySet().stream()

            String path = baseUri.relativize(f.toURI()).toString();
            failures.addAll(
                invalidLines.stream()
                    .map(l -> new AbstractMap.SimpleEntry<>(l + 1, lines.get(l)))
                    .flatMap(
                        kv -> patterns.entrySet()
                            .stream()