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Although
convenient and concise, the auto-declare behavior has on many occasions caused
confusion when a type name has accidentally been mistyped (and Dafny had then
accepted and auto-declared the name).
Note, the behavior of filling in missing type parameters is still supported. This
mode, although unusual (even original?) in languages, is different from the auto-
declare behavior. For auto-declare, identifiers could be used in the program
without having a declaration. For fill-in parameters, the implicitly declared
type parameters remain anonymous.
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Rustan Leino