Test cyclic graph, doc failure #228
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This creates a cyclic DFG, and demonstrates that it validates ok :-(. We don't have anything in validation to look for this yet.
It'd be great to turn this into an "expected-fail" tests but that looks quite hard, best plan appears to be to use cargo-nextest and I've not done that here.
Or, could extend this PR to include a fix, i.e. actually detect cycles.
So maybe this isn't ready yet