**"Variable is optimized away and not available."**, how can I view those variables in vscode?

[xiongmao86]

Hi, I am trying to debug a project call typst, when I debug the main function, in the local's view, some of the variables are not visible, and showing `Variable is optimized away and not available.

is that because of the way I build? I build with cargo build, and the output is dev [unoptimized + debuginfo]

P.S. Thanks for making this great app, I can't wait to learn more about it.

[lnicola]

Hi. This sometimes happens, e.g. on unused variables. Regardless of that, I don't think you can do much about it. Native language debuggers will always give a worse experience than those for managed languages.

We don't do anything besides setting up the debugging extension. Depending on your platform, you can try another one, there's at least three: C/C++, Native Debug and CodeLLDB.

[xiongmao86]

Hi, @lnicola, thank you for your help. English is not my first language, and I am a little bit confused, the c++ is the c++ extension of microsoft, I have heard of, what is Native Debug refer to?

[lnicola]

• https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools
• https://marketplace.visualstudio.com/items?itemName=webfreak.debug
• https://marketplace.visualstudio.com/items?itemName=vadimcn.vscode-lldb

[xiongmao86]

Thank you very much. @lnicola.

[lnicola]

If you try them, can you post your results and operating system, toolchain (-msvc or -gnu if Windows etc.), maybe a small snippet showing the problem for anyone else who has this problem?

[xiongmao86]

I experiment a little bit. The description would be incorrect, sometimes I have to step one more statement for variables of the current statement to show up, plus the description saying it's optimized away, so I assume they are not available. But they are available, only one step away.