ML Module Mania: A Type-Safe, Separately Compiled, Extensible Interpreter

  • Authors:
  • Norman Ramsey

  • Affiliations:
  • Division of Engineering and Applied Sciences, Harvard University

  • Venue:
  • Electronic Notes in Theoretical Computer Science (ENTCS)
  • Year:
  • 2006

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Abstract

To illustrate the utility of a powerful modules language, this paper presents the embedded interpreter Lua-ML. The interpreter combines extensibility and separate compilation without compromising type safety. Its types are extended by applying a sum constructor to built-in types and to extensions, then tying a recursive knot using a two-level type; the sum constructor is written using an ML functor. The initial basis is extended by composing initialization functions from individual extensions, also using ML functors.