I don’t think it succeeded or failed. Languages don’t need to be wildly popular in industry to be valuable. I personally like that industry ignores SML. Even

I don’t think it succeeded or failed. Languages don’t need to be wildly popular in industry to be valuable. I personally like that industry ignores SML. Even for Ocaml I don’t use the Jane street core: I just use the stock language since it’s small and stable. I like that Jane street helps improve the core compiler though.