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[SR-1635] [T!] iterates forever in for-in loop #44244

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swift-ci opened this issue May 28, 2016 · 3 comments
Closed

[SR-1635] [T!] iterates forever in for-in loop #44244

swift-ci opened this issue May 28, 2016 · 3 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@swift-ci
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Previous ID SR-1635
Radar None
Original Reporter austin (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

Tested on latest swift-3.0-preview-1 branch (e51c883), latest master branch (52de534), OS X 10.11.4

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: 2c7a6b664acd2daaf353938274f7c36e

Issue Description:

A for-in loop iterating over an array of implicitly unwrapped optional type (e.g. [Int!]) will iterate forever, even though there are a finite number of elements in the array.

var firstInt : Int!
var secondInt : Int!
var thirdInt : Int!

firstInt = 10
secondInt = 20
thirdInt = 30

let someArray = [firstInt, secondInt, thirdInt]

// Expected: prints three values
// Actual: loops forever, prints 'nil' after the three values in the array
for anObject in someArray {
    print(anObject)
}
@CodaFi
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CodaFi commented Jun 7, 2016

Reproducible on IBMs boxes running 3.0, but not on master anymore (not sure where exactly, but my guess would be 778a4ee). Looks like it was a problem with type inference and the new IUO restrictions.

@swift-ci
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swift-ci commented Jun 7, 2016

Comment by Austin Zheng (JIRA)

Thanks CodaFi (JIRA User)! I'll verify on OS X and Linux tonight and close the ticket if the problem's gone.

@slavapestov
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Works fine in Xcode 8.3.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@slavapestov @CodaFi @swift-ci