Why is the shorthand argument name $0 returning a tuple of all parameters?

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Closures § Shorthand Argument Names

Shorthand Argument Names

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the number and type of the shorthand argument names will be inferred from the expected function type.

It looks like this is the expected behavior. By providing only $0 you are inferring (at least to the system) that you want a tuple.

This only seems to be a special case of using $0. For example, the following cannot be compiled.

var returnAString3: (String, String, String) -> String
returnAString3 = { return $1 }

No matter how it’s modified.

returnAString3 = { return $1.0 } // still fails.

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