Implement simple do-while loop functionality #117
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An offshoot of #76, this implements simple do-while loop detection and output.
Should I add a new command-line option to disable this? It does add a new layer of nesting, since goto labels don't take up a nest level. I also don't know what the sentiment about this change is - perhaps it just gets in the way? (Nevertheless, it's important for #76, so that's why I'm breaking it off like this.)
I should probably run this on some entire projects to see what happens, also.
There's at least one confusing part (the
secretly=...code), which I plan to document soon, but haven't found the right words to explain properly.