Hello,

> According to a 2005 paper by Camarao and Figueiredo (found at
> http://www.dcc.ufmg.br/~camarao/ml-has-pt.pdf ), there is a variation
> of the usual Damas-Milner type system for core-ML that types the same
> terms and also has principal typings.
>
I hadn't heard of this work before. I'll try to take a look at it sometime.

> So the language ML does have principal typings, in the sense that it
> has a useful type system with principal typings, but afaik no ML
> implementation uses a such a type system.
>
Yes, I should have been more careful with my assertion. The paper I referenced actually shows that Hindley/Milner has no principal typings.

-Jeff
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