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Pants

I have this in a register.py

```
class DummyProduct:
  pass

@rule(DummyProduct, [])
def dummy():
  yield DummyProduct()


def rules():
  return [
    dummy,
  ]
```

what command should I run to trigger it?

Only @console_rule rules are addressable from the CLI and they take their name from their Goal subclass return type: <https://github.com/pantsbuild/pants/blob/master/src/python/pants/rules/core/test.py#L21-L28>

For dev purposes it might be nice to support spelling the full rule function name. Maybe rule@foo.bar.baz where the rule is the baz function in the foo.bar package.