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T4 is the "official" code generation engine for C#/VB.NET. But F# doesn't support it (this is from April, but I couldn't find any newer mentions). So what is a good way to generate F# code? EDIT: I want to implement 2-3 finger trees in F#. I already have implemented them in C#, so this should be a nice comparison. The "digits" and nodes of the tree can be represented as arrays, so type 't FingerTree = Empty | Single of 't | Deep of 't array * (('t FingerTree) array) lazy * 't array However, the maximum size of these arrays is very small, so it'd be nice to have type 't Digit = Digit1 of 't | Digit2 of 't*'t | Digit3 of 't*'t*'t | Digit4 of 't*'t*'t*'t type 't Node = Node2 of 't FingerTree * 't FingerTree | Node3 of 't FingerTree * 't FingerTree * 't FingerTree type 't FingerTree = Empty | Single of 't | Deep of 't Digit * ('t Node) lazy * 't Digit to avoid bounds checking, etc. But then writing all functions on Digit and Node by hand becomes more difficult, and it's better to generate them. And a T4-like approach looks perfect for it...

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