[swift-dev] Needs better error msg?

[Mark Lacey]

> On Sep 20, 2016, at 2:05 PM, Joe Groff via swift-dev <swift-dev at swift.org> wrote:
> 
>> 
>> On Sep 20, 2016, at 1:45 PM, Kevin Choi via swift-dev <swift-dev at swift.org> wrote:
>> 
>> b.sw:
>> func findIndex<T: Equatable>(array: [T], _ valueToFind: T) -> Int? {
>>    for (index, value) in array.enumerated() {
>>        if value == valueToFind {
>>            return index
>>        }
>>    }
>>    return nil
>> }
>> 
>> let foundAtIndex = findIndex([1, 2, 3, 4], 3)
>> print(foundAtIndex == 2) // true
>> 
>> ===================
>> ~/git/swift-source$ build/Ninja-RelWithDebInfoAssert/swift-linux-x86_64/bin/swift b.sw
>> b.sw:10:44: error: unnamed argument #2 must precede unnamed argument #1
>> let foundAtIndex = findIndex([1, 2, 3, 4], 3)
>>                             ~~~~~~~~~~~~  ^
>>                             3             [1, 2, 3, 4]
>> 
>> The error seems to arise from the requirement:
>>> If a parameter has an argument label, the argument must be labeled when you call the function.
>> 
>> Instead the shown error assumes the order is swapped because first argument was unnamed. Should the former (from requirement) be shown as the error here?
> 
> Yeah, that would make much more sense. If you have a moment, would you be able to report this as a bug on bugs.swift.org <http://bugs.swift.org/>?

I believe we already have one: https://bugs.swift.org/browse/SR-2242.

Mark

> 
> -Joe
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