Let Should not be Generalised

From the dawn of time, all derivatives of the classic Hindley-Milner

type system have supported implicit generalisation of local let-

bindings. Yet, as we will show, for more sophisticated type systems

implicit let-generalisation imposes a disproportionate complexity

burden. Moreover, it turns out that the feature is very seldom

used, so we propose to eliminate it. The payoff is a substantial simplification,

both of the specification of the type system, and of its


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In  Proceedings of the 5th ACM SIGPLAN Workshop on Types in Language Design and Implementation

Publisher  Association for Computing Machinery, Inc.
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