core: failing test for a bad module cycle

[phinze]

passing output of one module into input of the following module results
in a cycle

[mitchellh]

Merging this into the branch, goign to work on this.

[mitchellh]

So I figured this out: this cycle doesn't exist as long as PruneDestroyTransformer is properly run. But its not run because Verbose is set to true? That transformer is pretty important to run to get rid of real cycles that can exist in pathological cases. We are able to avoid those cycles by pruning vertices that generally don't need to be there because the case generally isn't pathological.

[ghost]

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