With Visual Studio 2019 Preview (currently version 16.2.0 Preview 3.0) you can use C# 8.0 in .NET Core 3.0 projects. You only have to set the Language version to C# 8.0 (beta) in the Advanced Build Settings. Make sure you do this for 'All configurations' and 'Any CPU', see screenshot below.
This setting will add a LangVersion property to your .csproj file (line 6).
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