Adding an attribute to a variable prevents its appearance in the Outline

[mikebm94]

Prerequisites

• I have written a descriptive issue title.
• I have searched all issues to ensure it has not already been reported.
• I have read the troubleshooting guide.
• I am sure this issue is with the extension itself and does not reproduce in a standalone PowerShell instance.
• I have verified that I am using the latest version of Visual Studio Code and the PowerShell extension.
• If this is a security issue, I have read the security issue reporting guidance.

Summary

When adding an attribute to a variable (in this case System.Diagnostics.CodeAnalysis.SuppressMessageAttribute, but the outcome is the same for other attributes such as ValidateSetAttribute), the variable will no longer appear the the 'Outline' panel.

Take this script for example:

$MyVariable = 'foobar'

The variable MyVariable appears in the 'Outline' panel. Now, add an attribute to it. In this case, I added the System.Diagnostics.CodeAnalysis.SuppressMessageAttribute attribute to disable the PSUserDeclaredVarsMoreThanAssignments warning from not using the variable in the current script.

[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUserDeclaredVarsMoreThanAssignments', '')]
$MyVariable = 'foobar'

The script works correctly, and the attribute correctly disables the warning, but the variable no longer appears in the 'Outline' panel.

PowerShell Version

Name                           Value
----                           -----
PSVersion                      7.2.2
PSEdition                      Core
GitCommitId                    7.2.2
OS                             Microsoft Windows 10.0.19043
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visual Studio Code Version

1.66.1
8dfae7a5cd50421d10cd99cb873990460525a898
x64

Extension Version

ms-vscode.powershell@2021.12.0

Steps to Reproduce

1. Create a variable in the top-level scope. (It appears in the Outline.)
2. Add an attribute to it. (It no longer appears in the Outline)

Visuals

No response

Logs

No response

[SydneyhSmith]

Thanks @mikebm94 for opening this issue and providing some details, looks like a bug