Let Should Not Be Generalised
- Dimitrios Vytiniotis ,
- Simon Peyton Jones ,
- Tom Schrijvers
Proceedings of the 5th ACM SIGPLAN Workshop on Types in Language Design and Implementation |
Published by Association for Computing Machinery, Inc.
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 implementation.
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