8357856622
While reviewing and reading code, label and helper methods are mixed in
Prog files. It's hard to identify sometimes without in-depth looking.
I propose to define labels with `self.label` class method.
One of clover's predecessor has `work_` prefix, and I think it
was useful.
It has some benefits:
1. It helps to identify label methods easily
2. It helps to keep list of valid labels, `hop` can check target label is
valid or not
3. It generates `hop_#{label}` methods. Instead of freehand `hop :label`
calls, we can call `hop_label` method similar to `incr_#{name}`
semaphore methods.
(2) and (3) have some overlapped benefits. They help to stay in valid
label world in different ways.
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