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[SR-3023] Infinite loop iterating through Array of IUOs #45613

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swift-ci opened this issue Oct 22, 2016 · 2 comments
Closed

[SR-3023] Infinite loop iterating through Array of IUOs #45613

swift-ci opened this issue Oct 22, 2016 · 2 comments
Labels
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-3023
Radar rdar://problem/27707015
Original Reporter antony.newman (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

Any SWIFT system. This bug has been outstanding for Months.
MacPro / Xcode just retested and the CPU goes pretty crazy

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

md5: 23f66f4a275084af1fbaead68898b5f6

relates to:

Issue Description:

//Copy the following into a Playground and watch your CPU hit 100% 

class INK
{
    var test = 1
}

var array = [INK!](repeating: nil, count: 1)

for idx in 0..<array.count
{
    array[idx] = INK()
}

var idx2 = 0
for ink_item in array
{
    idx2 += 1
    print("idx2=\(idx2)")
}
@belkadan
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Swift 3's supposed to reject arrays of IUOs altogether; the fact that this can be declared at all is a bug. That said, we're almost certainly checking the wrong level of optional here when deciding whether we've reached the end of the array. @rudkx, any ideas?

@DougGregor
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This is fixed in Swift 4; verified with Xcode 9 beta 4.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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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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@belkadan @DougGregor @swift-ci