Mechanisms for Improved Covariant Type-Checking
Covariant types are a powerful language feature for improving type-safety. However, covariant types complicate type-checking when combined with polymorphism. We propose two new language features that can improve type-checking in a language with polymorphism and covariant typing, and also have the potential to improve efﬁciency as well. Published by Elsevier Ltd.
& Thirunarayan, K.
(2008). Mechanisms for Improved Covariant Type-Checking. Computer Languages, Systems & Structures, 34 (1), 1-17.