Decidable subclassing-bounded quantification

Bounded quantification allows quantified types to specify subtyping bounds for the type variables they introduce. It has undecidable subtyping and type checking. This paper shows that subclassing-bounded quantification---type variables have subclassing bounds---has decidable type checking. The main difficulty is that, type variables can have either upper bounds or lower bounds, which complicates the minimal type property.

decidable_tldi05.pdf
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In  ACM Workshop on Types in Language Design and Implementation (TLDI 05)

Publisher  Association for Computing Machinery, Inc.
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