e -> e.getKey(),
                                e -> e.getValue() == location ? this : new InputLocation(e.getValue())));
        this.importedFrom = location.getImportedFrom() != null ? new InputLocation(location.getImportedFrom()) : null;
    }

    public InputLocation(int lineNumber, int columnNumber) {
        this.lineNumber = lineNumber;
        this.columnNumber = columnNumber;