Hi Jay,
I think defining your own AST and then compiling it/interpreting it is the more common type of metaprogramming in F# and generally works well.
You can use quotations to metaprogram in F# but your kinda stuck with the existing F# syntax, which can be problematic. However it does have its uses, Flinq is one example and I've blogged about how solver foundation uses quotations here:
Cheers,
Rob
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In my limited understanding of F# - ASTs are used to define the "vocabulary" of the DSL you are implementing and DSLs are one way of metaprogramming. Another form of metaprogramming is using Expression trees and applying transforms on them, adding/modifying nodes - generating/modifying code as you walk the tree.
I have come across examples of the former in F#, but havent _yet_ come across samples of the latter and am looking for such. I guess my question really is what are the categories of metaprogramming that F# cannot participate in