The current code is

    public $Type$Buffer put(String src, int start, int end) {
        checkScope();
        int length = end - start;
        Objects.checkFromIndexSize(start, length, src.length());
        if (isReadOnly())
            throw new ReadOnlyBufferException();

but should be using the #if[rw]-#else[rw]-#end[rw] construct as elsewhere in the template.