Inconsistent compile time behavior using unimplemented

[kgrigsby59]

This produces a compile time error as expected because unimplemented takes at most 5 parameters

let f06: (String, Int, Double, [Int], User, Int) -> Int = unimplemented("f06", placeholder: 42)
// No 'unimplemented' candidates produce the expected contextual result type '(String, Int, Double, [Int], User, Int) -> Int'

It would be very helpful if this would also.

let f06: (String, Int, Double, [Int], User, Int) -> Int = unimplemented("f06") // no placeholder