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I'm not sure it's a particularly faithful port of ML, and particularly not SML. It doesn't really look anything like ML. It looks like a bit of a mishmash of syntaxes, if anything, so I'm really not sure what makes it "ML derived" any more than it is Python-derived or Algol-derived.

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Here is a list of features that Yeti has that are either not in Python or not in Algol. That is, none of these features is in both Algol-60 and Python:

* static typing

* discriminated unions

* first-class functions

* immutability by default

* pattern matching

These are all present in both Yeti and SML.

Yes, Yeti is not SML, but I think it's much closer to ML and Friends than it is to any other language family, even Haskell or Scala.

Syntax is only half the picture. Semantics-wise, I'd say it's reasonably "ML derived".

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