See the documentation about "active patterns" in [MLStyle](https://thautwarm.github.io/MLStyle.jl/latest/syntax/pattern.html#active-patterns) and [F#](https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/active-patterns). We should consider supporting those.
See the documentation about "active patterns" in MLStyle and F#. We should consider supporting those.