As I'm constantly bumping into typing issues when converting EOPL's examples and exercises from Scheme to F# (a ML language), I found this code/article by Oleg Kyseliov relevant. It embeds a Scheme-like language into OCaml, using variant types, and defines functions used in Scheme. The scheme.ml file is quite interesting for going all the way with the Scheme conversion, but the use of variant types to capture the need to work with different types in the same context is known to every ML programmer. I even did it sometimes in the EOPL programs.
Be sure to read Oleg's comments about it.
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