"Int is not convertible to IntegerLiteralConvertible"... Huh?

Question

Created Jul ’15

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Xcode 7 Beta 4, the following code:

let view = myOutlineView.viewAtColumn(1, row: checkbox.tag, makeIfNecessary: false)
                                      ^

gives me an error: "'Int' is not convertible to 'IntegerLiteralConvertible'" at the first arguemnt.

Huh? The interface for viewAtColumn is:

func viewAtColumn(column: Int, row: Int, makeIfNecessary: Bool) -> NSView?

So, if I pass in non-literal values, no error:

let col = 1
let make = false
let view = myOutlineView.viewAtColumn(col, row: checkbox.tag, makeIfNecessary: make)

Am I missing something, or is this a bug in Swift/Xcode/NSOutlineView?

Answered by ChrisLattner in 32294022

This is a fairly classical example of when the type checker gets confused and emits a non-sensical diagnostic. This is one of the areas of focus to improve in Xcode 7, so if you run across examples like this, please file a radar with an (ideally small) example that shows it. Beta 4 has some improvements to these sorts of diagnostics, but more improvements are coming.

-Chris

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Answer 1

Jens OP

Jul ’15

I can't reproduce that error, ie the following short program compiles as expected in Xcode 7 beta 4:

import Cocoa
let myOutlineView = NSOutlineView()
let checkbox = NSButton()
let view = myOutlineView.viewAtColumn(1, row: checkbox.tag, makeIfNecessary: false)

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Answer 2

OOPer OP

Jul ’15

With the first line of code you have shown (supplying myOutlineView & checkbox), I cannot get any error messages from my Xcode 7 beta 4.

Maybe some other parts of your code is affecting, like making something IntegerLiteralConvertible.

0

Answer 3

karim OP

Jul ’15

Sigh... and now the error has gone away... I can't reproduce it either. I'm going to pretend this never happened 😉

Thanks all.

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Answer 4

ChrisLattner OP

Jul ’15

Accepted Answer

This is a fairly classical example of when the type checker gets confused and emits a non-sensical diagnostic. This is one of the areas of focus to improve in Xcode 7, so if you run across examples like this, please file a radar with an (ideally small) example that shows it. Beta 4 has some improvements to these sorts of diagnostics, but more improvements are coming.

-Chris

0

Answer 5

karim OP

Jul ’15

Thanks Chris, glad I'm not going crazy 😉

I'll keep an eye out for things like this and get radars in when I can.

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