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There have been various variable arity generic discussions on the internals forum (internals.rust-lang.org), but I think it's a significantly lower priority iss

• chrismorgan 5y ago
  This is my position, too. I think everyone agrees that we want to get generic tuples, but there are other higher priority issues still, so it’s mostly more a backburner project worth thinking about when designing things, and slowly working towards as good a design as we can come up with which fits in with the rest of the language (including future possibilities) as well as possible. Even in a vacuum it’s not trivial to design something both satisfactory and implementable, and when you add other language features, corners the language has been designed into, and corners you want to avoid painting the language into, it gets much harder still.