"error CS1545: Property, indexer, or event is not supported by the language" on attempt to _read_ init-only property

[alexyakunin]

Describe the bug

Attempting to access any init-only property produces "error CS1545: Property, indexer, or event is not supported by the language" in dotnet-try tool.

Did this error occur while using dotnet try or online?

• dotnet-try
• online

What kind of error was it?

• User Interface (UI): For example the output never displayed
• Service Error: For example "The service is temporarily unavailable. We are working on it"
• Other:

Screenshots

Please complete the following:

• OS
  • Windows 10
  • macOS
  • Linux (Please specify distro)
  • iOS
  • Android
• Browser
  • Chrome
  • Edge
  • Safari

[alexyakunin]

The problem is severe: it prevents using dotnet-try w/ any NuGet packages involving this C# 9 feature.