Abstract
We demonstrate the pragmatic value of the principal typing property, a property distinct from ML's principal type property, by studying a type system with principal typings. The type system is based on rank 2 intersection types and is closely related to ML. Its principal typing property provides elegant support for separate compilation, including smartest recompilation and incremental type inference. Moreover, it motivates a new rule for typing recursive definitions that can type some interesting examples of polymorphic recursion.
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