I see a lot of correlations between parsing train tracks and BNF and error handling and state machines. I wrote a bit about it here https://github.com/samsqui

I see a lot of correlations between parsing train tracks and BNF and error handling and state machines. I wrote a bit about it here https://github.com/samsquire/ideas5#252-happy-path-state-machines-parsing-and-how-it-relates-to-control-flow-of-state-machines-train-track-rendering https://github.com/samsquire/ideas5#252-happy-path-state-mac... The problem: how do you re-join the control flow paths to the happy path.