Dismissing the \Final Concern" or Matches Rides Again A Position Paper for the ANSA workshop on F-bounded quanti cation
نویسنده
چکیده
The F-bounding condition is de ned by Canning et al. [Canning 89] as t F [t], where is the subtyping relation and F [t] is an expression, generally containing the type variable t. Because Canning's work is proof theoretic, this essentially syntactic de nition is natural. In our technical report \Typechecking Polymorphism in Emerald", Hutchinson and I de ne the relation . (read matches) used to constrain type parameters in Emerald [Black 91]. Here the setting is model-theoretic: if t is a type, and C is a type generator (a function from types to types), then
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