Pre-RFC: parameter names in closure type declarations: fn search(should_continue: impl FnMut(x: i32, y: i32) -> bool) {} The argument names are completely ignored by the compiler, but they help disambiguate things for the reader.
I've definitely wanted this, but am wary. We've gone the *other* way in traits: https://rust-lang.github.io/rfcs/1685-deprecate-anonymous-parameters.html …
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Isn’t that the same way?
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What I mean is: we've moved towards not giving you a choice of either having labels or not having labels.
End of conversation
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