Static dependent types for first class modules

Static dependent types are the basis of a new type system that permits types and values to be packaged together into first class modules. Unlike other approaches to modules, static dependent types permit unrestricted access to the types and values in first class modules without sacrificing static type checking or data abstraction. Static dependent types are type safe in the presence of side effects because they rely on an effect system that can make deductions conventional type systems cannot. Experience with an implementation, built as an extension to the FX-87 programming language, shows that static dependent types can be used for building large systems.