Abstract:Recent type systems allow the programmer to use types that describe more precisely the invariants on which the program relies. But in order to satisfy the type system, it often becomes necessary to help the type checker with extra annotations that justify why a piece of code is indeed well-formed. Such annotations take the form of term-level type manipulations, such as type abstractions, type applications, existential package packing and opening, as well as coercions, or casts. While those operations have no d… Show more
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