Extension crashes with ParseError: The '<' operator is reserved for future use

Issue Description

Whenever I open a PowerShell file (ps1 / psm1) the extension crashes like so:

I tried the following to no effect:

• uninstall + reinstall
• preview version
• Restart vscode
• Restart computer

Attached Logs

6/23/2020 5:30:07 PM [NORMAL] - Visual Studio Code v1.46.1 64-bit
6/23/2020 5:30:07 PM [NORMAL] - PowerShell Extension v2020.6.0
6/23/2020 5:30:07 PM [NORMAL] - Operating System: Windows 64-bit
6/23/2020 5:30:07 PM [NORMAL] - Language server starting --
6/23/2020 5:30:07 PM [NORMAL] -     PowerShell executable: C:\Users\ohad1\.dotnet\tools\pwsh.exe
6/23/2020 5:30:07 PM [NORMAL] -     PowerShell args: -NoProfile -NonInteractive -ExecutionPolicy Bypass -Command Import-Module 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2020.6.0' -AdditionalModules @('PowerShellEditorServices.VSCode') -BundledModulesPath 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\modules' -EnableConsoleRepl -StartupBanner "=====> PowerShell Integrated Console v2020.6.0 <=====
" -LogLevel 'Normal' -LogPath 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\logs\1592922607-427b8a15-52cc-47ce-b42c-273cfda30f671592922585773\EditorServices.log' -SessionDetailsPath 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\sessions\PSES-VSCode-22388-563996' -FeatureFlags @() 
6/23/2020 5:30:07 PM [NORMAL] -     PowerShell Editor Services args: Import-Module 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2020.6.0' -AdditionalModules @('PowerShellEditorServices.VSCode') -BundledModulesPath 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\modules' -EnableConsoleRepl -StartupBanner "=====> PowerShell Integrated Console v2020.6.0 <=====
" -LogLevel 'Normal' -LogPath 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\logs\1592922607-427b8a15-52cc-47ce-b42c-273cfda30f671592922585773\EditorServices.log' -SessionDetailsPath 'c:\Users\ohad1\.vscode\extensions\ms-vscode.powershell-2020.6.0\sessions\PSES-VSCode-22388-563996' -FeatureFlags @() 
6/23/2020 5:30:07 PM [NORMAL] - pwsh.exe started.
6/23/2020 5:30:07 PM [NORMAL] - Waiting for session file
6/23/2020 5:34:08 PM [NORMAL] - Timed out waiting for session file to appear.
6/23/2020 5:34:08 PM [NORMAL] - Language server startup failed.
6/23/2020 5:34:08 PM [ERROR] - The language service could not be started: 
6/23/2020 5:34:08 PM [ERROR] - Error: Timed out waiting for session file to appear.

It looks like the < in the StartupBanner is causing the issue

Environment Information

Visual Studio Code

Name	Version
Operating System	Windows_NT x64 10.0.18363
VSCode	1.46.1
PowerShell Extension Version	2020.6.0

PowerShell Information

PS C:\> $psEditor.EditorServicesVersion
PS C:\> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      5.1.18362.752
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.18362.752
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

I don’t know why 5.1 is loaded - I have the latest PowerShell Core (7.0.02) installed and working (e.g. in Windows Terminal).

Visual Studio Code Extensions

Visual Studio Code Extensions(Click to Expand)

Extension	Author	Version
azure-account	ms-vscode	0.8.11
azurerm-vscode-tools	msazurermtools	0.11.0
ginfuru-vscode-jekyll-syntax	ginfuru	0.1.1
html-preview-vscode	tht13	0.2.5
language-liquid	neilding	0.1.1
mssql	ms-mssql	1.9.0
powershell	ms-vscode	2020.6.0
remote-wsl	ms-vscode-remote	0.44.4
team	ms-vsts	1.161.0
vscode-aks-tools	ms-kubernetes-tools	0.0.6
vscode-docker	ms-azuretools	1.3.1
vscode-dotnet-runtime	ms-dotnettools	0.1.2
vscode-kubernetes-tools	ms-kubernetes-tools	1.2.1
vscode-yaml	redhat	0.8.0
xml	DotJoshJohnson	2.5.0

[ohadschn]

Thanks, I can confirm .NET tool uninstall + install regular PS MSI works! Sure is good enough for me, but I do like the global tool approach because it’s basically a package manager - not crazy about going off to download MSIs every time a new version comes out… When WinGet is GA I guess that won’t be an issue though (assuming this behavior doesn’t reproduce there of course).

As for my setup, pretty straightforward - display language is English, preferred language it English (I do have Hebrew installed alongside it but it never caused any issue AFAIK). English keyboard layout is standard US QWERTY…

[ohadschn]

@andschwa looks good, thanks!