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This is an excellent example of using a parser as a language. Whether it has any legs depends on whether it beats existing tools on some front (sed, perl, ruby, etc). The concurrent angle is interesting, but I have found a multi-process approach to stream data to be more efficient than most concurrent single-process implementations. For example, with DAP (https://github.com/rapid7/dap), we found that GNU Parallel + Ruby MRI was more effective than a concurrent language such as Go.

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