Colored local type inference

  • Authors:
  • Martin Odersky;Christoph Zenger;Matthias Zenger

  • Affiliations:
  • École Polytechnique Fédérale de Lausanne;École Polytechnique Fédérale de Lausanne;-

  • Venue:
  • POPL '01 Proceedings of the 28th ACM SIGPLAN-SIGACT symposium on Principles of programming languages
  • Year:
  • 2001

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Abstract

We present a type system for a language based on F≤, which allows certain type annotations to be elided in actual programs. Local type inference determines types by a combination of type propagation and local constraint solving, rather than by global constraint solving. We re ne the previously existing local type inference system of Pierce and Turner[PT98] by allowing partial type information to be propagated. This is expressed by coloring types to indicate propagation directions. Propagating partial type information allows us to omit type annotations for the visitor pattern, the analogue of pattern matching in languages without sum types.