[SR-600] Wrong signature for Array's Sort method

[swift-ci]

Previous ID	SR-600
Radar	None
Original Reporter	mitghi (JIRA User)
Type	Bug
Status	Closed
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	CodeCompletion
Labels	Bug
Assignee	None
Priority	Medium

md5: 4ae0b0e4c3e24bdc29ff395aa620435d

Issue Description:

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

When declaring an array, for example an array of strings, on tab completion we see the wrong signature for the sort method :

sort(isOrderedBefore: (String, String) -> Bool(String, String) -> Bool) -> [String]

(String, String) -> Bool is somehow printed twice which creates confusion.

This problem is happening on the following version:

Swift version 2.2-dev (LLVM 3ebdbb2c7e, Clang f66c5bb67b, Swift 1f2908b)
Target: x86_64-unknown-linux-gnu

[belkadan]

@benlangmuir, @nkcsgexi, I thought this was fixed a while ago?

[nkcsgexi]

@belkadan Yes, I think this is fixed.

[belkadan]

Since December, though? The tagged commit is from 12/30.

[nkcsgexi]

This is strange. We dropped sort() function long time ago.

[belkadan]

Method, not function. Try tab-completing [1,2,3].sort.

[nkcsgexi]

Just tried in Xcode, this works correctly for me.

[belkadan]

That makes it a regression, doesn't it? I reproduced it in yesterday's master in the integrated (testing) REPL.

[nkcsgexi]

I see. This is not a bug. This reason we see "sort({#(isOrderedBefore): (Int, Int) -> Bool##(Int, Int) -> Bool#})#[Int#]" is that the same signature is two parts
of the same placeholder, for presentation and type info, respectively. They are not duplication but convey different meaning.

[belkadan]

Ah, but we don't see that in the testing REPL. Do we know why?

[swift-ci]

Comment by Atie (JIRA)

I can see similar signature style in these methods below :
map(transform: (Int) throws -> T(Int) throws -> T) -> [T]
maxElement(isOrderedBefore: (Int, Int) throws -> Bool(Int, Int) throws -> Bool) -> Int?

I also use 2.2-dev on Linux, and this is utterly confusing. I couldn’t find documentation for ‘ presentation and type info ‘ in this way on the Internet. Please clarify . Thanks

[Dante-Broggi]

Has this been resolved? If so, it should be closed.

[AnthonyLatsis]

This was probably fixed long ago, but FWIW the issue does not exist in the latest Xcode release.