Right off the bat, I would say that would be prettier if we had argument auto-borrowing
I'm again pretty nervous about this, because this is one of the much-maligned features of C++ references. *Why* is it maligned, though? and if closure assignment was in scope to be captured inside the closure itself (wouldn't have to do dummy init of the B var). This would prevent the useful `let mut foo = foo` pattern. How so?
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