ddc-core-0.4.3.1: Disciplined Disciple Compiler core language and type checker.

Disciple Core is an explicitly typed language based on System-F2, intended as an intermediate representation for a compiler. In addition to the polymorphism of System-F2 it supports region, effect and closure typing. Evaluation order is left-to-right call-by-value by default. There is a capability system to track whether objects are mutable or constant, and to ensure that computations that perform visible side effects are not reordered inappropriately. See the ddc-tools package for a user-facing interpreter and compiler.