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NCrunch 4 - Instrumentation Mode - Optimized - "The name [x] does not exist in the current context"
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mattyboy
#1 Posted : Monday, November 11, 2019 1:24:38 AM(UTC)
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Hi

When debugging my .NET Core 2.2 project (XUnit 2.4.1), if I have an exception in my test code, I can't hover over other variables in the method and see their values.
If I try Quickwatch, it says "The name [blah] does not exist in the current context".

Optimised mode:



Legacy mode:



Matt
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Remco
#2 Posted : Monday, November 11, 2019 3:27:29 AM(UTC)
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Hi Matt,

Thanks for sharing this problem.

I'm fairly certain this is caused by something funky in the debug information that exists because of the async method block.

Are you working with a portable PDB, or a Win32 one? Does switching between them make any difference?

Are you able to produce this problem with a small sample project that you can share with me? You can submit ZIPed code through the NCrunch contact form.
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Remco
#3 Posted : Tuesday, November 26, 2019 1:48:43 AM(UTC)
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mattyboy
#4 Posted : Thursday, November 28, 2019 12:49:49 AM(UTC)
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Hi Remco

I've downloaded the VS2019 version of NCrunch to try it out. However, my solution fails to build with Optimised mode enabled:



Annoyingly, I can't see why it's failing to build.

Fortunately, Legacy mode still works fine.

Matt
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Remco
#5 Posted : Thursday, November 28, 2019 1:30:39 AM(UTC)
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Hi Matt,

Could you submit a bug report for me after this happens? Something must be failing internally.
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mattyboy
#6 Posted : Thursday, November 28, 2019 3:19:32 AM(UTC)
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Remco;14155 wrote:
Hi Matt,

Could you submit a bug report for me after this happens? Something must be failing internally.


Sure. I just submitted one.

Matt
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Remco
#7 Posted : Thursday, November 28, 2019 4:26:48 AM(UTC)
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Thanks Matt.

It looks like you're experiencing this problem: https://forum.ncrunch.net/yaf_postst2864_IndexOutOfRangeException-with-new-instrumentation-mode.aspx.

Presently, I don't know how to reproduce this issue. The interactions here are complex enough that it will be hard (maybe impossible) to narrow it down through Q&A and guesswork. Something is different about the structure of this assembly.

Is there any chance you can reproduce this in a sample project that you can share with me? Note that you can submit code in ZIP form through the NCrunch contact form.
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mattyboy
#8 Posted : Friday, November 29, 2019 2:40:32 AM(UTC)
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Hi Remco.

Hmm. I just spent about half an hour stripping out most of the functionality from my solution, so I was just left with one controller and a few test classes, so that I could upload it to you.

Switched to Optimised mode = it now builds and runs.

So then I switched back to my develop branch (i.e. with functionality restored, and around 300 tests), and hey presto, Optimised mode still builds and runs.

Let's see what happens if I close and open VS... yep, Optimised mode can still build. Cool.

OK, let's see if my original bug is now fixed...

Nope. I still get "The name 'service' does not exist in the current context".

Let's see if when I switch back to my "stripped down controller and only a few test classes for Remco" branch, if the same thing still happens... yes, it does. I will upload a solution for you.

Matt
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Remco
#9 Posted : Tuesday, December 10, 2019 1:28:04 AM(UTC)
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1 user thanked Remco for this useful post.
mattyboy on 12/10/2019(UTC)
mattyboy
#10 Posted : Tuesday, December 10, 2019 3:42:07 AM(UTC)
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Thanks for the fix Remco - I can confirm it's working with my solution :-)

What was the underlying cause? Was it something funky in my solution?

Matt
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Remco
#11 Posted : Tuesday, December 10, 2019 11:59:49 AM(UTC)
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Thanks for confirming! We were corrupting some of the metadata inside the PDB. It was affecting all projects building a non-portable PDB and only affecting yield/async methods as far as I can tell.
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