option with << op

[yanganto]

No description provided.

[taorepoara]

@yanganto Here is the pull request for a failing example for this case: #44

Each commit is a step for what I meant:

1. Change of the example to highlight the problem: 2404149
   This works fine with let patched_user = user << patch << next_patch; but not with let patched_user = user << (patch << next_patch);
2. Adaptation of the derive to fix the patch1 << patch2 problem: d4ba5d6
3. Change of the option management to fix the last problem: (coming soon)