I am looking at and following example code that has the following lines:

public static DispenseOptionSketchVolume DoSketchVolume = new();
public static SketchSettingsPageData SketchSettingsPageData = new();
public static BlockVolumeData BlockVolumeData = new();
public static SketchEntityVolumePage SketchEntityVolume = new();

In my own project I created a framework 4.8 class library but get the error:

Feature 'target typed object creation' is not available. Please use language version 9.0 or greater. new(); is the error.

If I add this to my own csproj:

<PropertyGroup>
    <LangVersion>9.0</LangVersion>
</PropertyGroup>

Visual Studio asks me to attach to a process:

In the example project the framework is set to 4.8, the type is a class Library, there is a framework that automatically registers the dll and it runs. There is no <LangVersion> directive in any file csproj or otherwise.

How could the example project compile the = new(); statements?