F# compiler bug in release mode in VS2015 Update 1 #759

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2. mjmckp commented on Dec 3, 2015

   

   mjmckp

   on Dec 3, 2015

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   Replacing 'set' with 'seq' above also causes the compile error.
3. dsyme commented on Dec 3, 2015

   

   dsyme

   on Dec 3, 2015

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   This is the same as the bug fixed by #756. Let's use this as the tracking issue for the problem.
4. KevinRansom

   added

   Resolution-Fixed

   Approved for next preview

   Impact-High(Internal MS Team use only) Describes an issue with extreme impact on existing code.(Internal MS Team use only) Describes an issue with extreme impact on existing code.

   on Dec 4, 2015
5. KevinRansom commented on Dec 4, 2015

   

   KevinRansom

   on Dec 4, 2015

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   Fix merged:
   commit:
   c1e0bc8
   PR:
   #759
6. KevinRansom

   closed this as completedon Dec 4, 2015
7. KevinRansom commented on Dec 4, 2015

   

   KevinRansom

   on Dec 4, 2015

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   Thank you for reporting this. The fix is in, it will be in the next release of Visual F#.
8. dsyme commented on Dec 5, 2015

   

   dsyme

   on Dec 5, 2015

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   f you do need to get your code to compile and you are using Update 1, it appears sufficient to place something benign prior to any loop where this problem is occurring, like this:

   // do something that doesn't get optimized away
   let workaround() = null |> ignore  
   
   let configure () =
    let aSequence = Microsoft.FSharp.Core.Operators.(..) 3 4
    let aString = new string('a',3)
    workaround()
    for _ in aSequence do
      System.Console.WriteLine(aString)
   
   configure ()
   
   

   That said I really hope a fix is made available as soon as possible.

   Obviously these calls should be removed as soon as a fix release is made available.
9. matthid

   added 4 commits that reference this issue on Apr 24, 2016

   workaround compiler bug. dotnet/fsharp#759 (comment)

   5eee45d

   workaround compiler bug. dotnet/fsharp#759 (comment)

   89640f5

   workaround compiler bug. dotnet/fsharp#759 (comment)

   1b5a968

   workaround compiler bug. dotnet/fsharp#759 (comment)

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10. smoothdeveloper

    added a commit that references this issue on Apr 25, 2016

    workaround compiler bug. dotnet/fsharp#759 (comment)

    5f63ea2
11. smoothdeveloper

    added a commit that references this issue on May 3, 2016

    workaround compiler bug. dotnet/fsharp#759 (comment)

    9f86ad3