duplicates:

• SR-773 Using Array initializer syntax with nested types causes bad error message

Issue Description:

The shorthand of [T] for Array<T> didn't seem to work when trying to initialize the array when T is a nested type.

Details

Given a class with a nested struct

class C {
    struct S {
        let title: String
    }
}

I want to use it from another class, but initializing this array property using the shorthand didn't work like I expected.

Here were a few steps that I went through (based on the error messages and Fixits):

Step 1:
I first tries this, to make a stored property that's initialized to the empty array.

class C2 {
    var state = [C.S]()  // <-- Error: Invalid use of '()' to call a value of non-function type '[UKUploadGroupTracker.UploadGroupInfo.Type]'
                         //     Fixit: Delete the ()
}

Step 2:
So, try the suggested Fixit, deleting the ().

class C2 {
    var state = [C.S]  // <-- Error: Expected member name or constructor call after type name
                       //     Fixit: add () inside the ]
}

Step 3:
Try that Fixit, adding the () inside the ].

class C2 {
    var state = [C.S()]  // <-- Error: Cannot invoke value of type 'C.S.Type' with argument list '()'
}

Step 4:
Use a different syntax to initialize the array. This does work.

class C2 {
    var state: [C.S] = []
}

Step 5:
Use another different syntax to initialize the array. This works also.

class C2 {
    var state = Array<C.S>()
}

Expect

I expected my first attempt in Step 1 to just be shorthand for Step 5, but Step 1 didn't work, and Step 5 did.

Notes

• It doesn't work to do var state = [C.S]() inside a func in that class either.