Bug 27891 - Using the debug visualiser on an F# sequence (which is IEnumerable) results in an error
Summary: Using the debug visualiser on an F# sequence (which is IEnumerable) results i...
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: Debugger ()
Version: unspecified
Hardware: PC Mac OS
: Normal normal
Target Milestone: 5.9
Assignee: David Karlaš
Depends on:
Reported: 2015-03-11 12:16 UTC by Dave Thomas
Modified: 2015-03-20 13:13 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

Debug visualiser error (99.77 KB, image/png)
2015-03-11 12:19 UTC, Dave Thomas

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Description Dave Thomas 2015-03-11 12:16:13 UTC

Comment 1 Dave Thomas 2015-03-11 12:19:11 UTC
Created attachment 10271 [details]
Debug visualiser error
Comment 2 Dave Thomas 2015-03-11 12:19:34 UTC
With the following console test project:

let main argv =
    let test = seq {yield! [42..50]}
    printfn "%A" test
    0 // return an integer exit code

If you place a break pointy at the line:  printfn "%A" test, then the debug visualiser show the attached error.
Comment 3 Dave Thomas 2015-03-11 12:30:34 UTC
Its actually the same error with a F# list too, which is also IEnumerable:

let test2 = [42..50]
Comment 4 Rajneesh Kumar 2015-03-13 12:03:54 UTC
I have checked this issue and able to reproduce this. To reproduce this issue I have followed the steps mentioned below:

1. Create a F# console application in XS.
2. Add code provided in comment 2 to Program.fs .
3. Set break point at line : printfn "%A" test
4. Run the application, breakpoint will hit.
5. Hover on test at line : let test = seq {yield! [42..50]}
6. Expend tool tip Go to test=> IEnumerator => Click 'Show details'
7. Observed that IEnumerable results in an error. 

Screencast: http://www.screencast.com/t/dt7y768A

Application Output: https://gist.github.com/Rajneesh360Logica/4e093038f4b49985b134
Ide Logs: https://gist.github.com/Rajneesh360Logica/b1b57419f9296e96ddbf
Build Output: https://gist.github.com/Rajneesh360Logica/3a72fbcb08a5cfd0d791

Environment Info:

=== Xamarin Studio ===

Version 5.9 (build 210)
Installation UUID: 011d70a5-dede-428b-ab04-ef451c2e539d
	Mono 4.0.0 ((detached/1bd3b8a)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400000051

=== Apple Developer Tools ===

Xcode 6.2 (6776)
Build 6C131e

=== Xamarin.iOS ===

Version: (Business Edition)
Hash: 7e1f69e
Build date: 2015-03-12 15:35:49-0400

=== Xamarin.Android ===

Version: (Business Edition)
Android SDK: /Users/MM/Desktop/android-sdk-macosx
	Supported Android versions:
		2.1    (API level 7)
		2.2    (API level 8)
		2.3    (API level 10)
		3.1    (API level 12)
		4.0    (API level 14)
		4.0.3  (API level 15)
		4.1    (API level 16)
		4.2    (API level 17)
		4.3    (API level 18)
		4.4    (API level 19)
		4.4.87 (API level 20)
		5.0    (API level 21)
Java SDK: /usr
java version "1.7.0_65"
Java(TM) SE Runtime Environment (build 1.7.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

=== Xamarin Android Player ===

Version: Unknown version
Location: /Applications/Xamarin Android Player.app

=== Xamarin.Mac ===

Version: (Business Edition)

=== Build Information ===

Release ID: 509000210
Git revision: f32ddb8c1f9836ba5e018ac51056008e9a1ac208
Build date: 2015-03-12 10:06:56-04
Xamarin addins: abfe34dd3ad6ef1a3b720d6cd74441c8e7aa22ff

=== Operating System ===

Mac OS X 10.9.5
Darwin MacMini.local 13.4.0 Darwin Kernel Version 13.4.0
    Sun Aug 17 19:50:11 PDT 2014
    root:xnu-2422.115.4~1/RELEASE_X86_64 x86_64
Comment 5 David Karlaš 2015-03-17 08:34:59 UTC
Part of https://github.com/mono/monodevelop/pull/807
Comment 6 Lluis Sanchez 2015-03-17 11:24:30 UTC
Fixed in 5.9.
Comment 7 xamarin-release-manager 2015-03-20 13:13:40 UTC
Fixed in version (new-project-model)