rust-scan-rules

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I was looking for something like this and thought it was a good solution until I discovered that it panics when (for example) let_scan doesn't match a pattern, which means it is not useful in production code. Finding that it hasn't been updated since 2016 and there a no issues means I think that it is not used nor being maintained, so it might be good to mark the README with a warning such as deprecation, and point people to other solutions.

In my case I found the Regex was a good alternative. You can see my newbie journey summed up in this topic.

Meanwhile, thanks for providing a nice solution and if it was to be picked up and brought up to date with idiomatic Rust (i.e. returning Result rather than panic'ing) I think it could still be a neat option. I like the Rust pattern matching style for example.