The example with go yacc doesn't work about nex HOT 3 OPEN

I wrote nex way back in the Go 1.0 days, and looks like a lot has changed since then. I rarely use Go or yacc-like tools these days, so I'm afraid I don't know when I'll get around to fixing this.

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I seem to be having a similar issue that when returning types from actions, EOF always panics. @blynn Can you add more examples of returning types from actions? For instance, this example

%%
"+"    { return ADD; }
%%

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@drewwells I've got a bunch of examples in https://github.com/purpleidea/mgmt/tree/master/lang

If that's not enough LMK. I have a plan to write a blog post about this all too.

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