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Regular expressions: Rust vs F# vs Scala

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Let's implement the following task: read first 10M lines from a text file of the following format: then find all lines containing Microsoft namespace in them, and format the type names the usual way, like "Microsoft.Win32.IAssemblyEnum". First, F#: Now Rust: After several launches the file was cached by the OS and both implementations became non IO-bound. F# one took 29 seconds and 31MB of RAM at peak; Rust - 11 seconds and 18MB. The Rust code is as twice as long as F# one, but it's handling all possible errors explicitly - no surprises at runtime at all. The F# code may throw some exceptions (who knows what kind of them? Nobody). It's possible to wrap all calls to .NET framework with `Choice.attempt (fun _ -> ...)`, then define custom Error types for regex related code, for IO one and a top-level one, and the code'd be even longer then Rust's, hard to read and it would still give no guarantee that we catch all possible exceptions. Up...
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Akka.NET Streams vs Hopac vs AsyncSeq

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Akka.NET Streams is a port of its Scala/Java counterpart and intended to execute complex data processing graphs, optionally in parallel and even distributed. It has quite different semantics compared to Hopac's one and it's wrong to compare them feature-by-feature, but it's still interesting to benchmark them in a scenario which both of them supports well: read lines of a file asynchronously, filter them by a regex in controlled degree of parallelism, then normalize the lines with a simple string manipulation algorithm, also in parallel, then count the number of lines. Firts, Akka.NET: Note that I have to use the empty string as indication that the regular expression does not match. I should use `option ` of course (just like I do in the Hopac snippet below), but Akka.NET Streams is strict about what is allowed to be returned by its combinators like `Map` or `Filter`, in particular, you cannot return `null`, doing so makes Akka.NET unhappy and it will throw exception...
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