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Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported

With the release of .NET 5 it was finally time to try record types. Here is my first attempt that I copied from the documentation:

Unfortunately this turned out not the success I was hoping for. Visual Studio returned the following error message:

Severity

Code

Description

Project

File

Line

Suppression State

Error

CS0518

Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported

NHibernate.Tests

C:\NHibernate.Tests\Domain\Product.cs

17

Active

The error is not very descriptive but the reason I got it because I forgot to update the project to .NET 5. The fix was easy; after updating the target framework the error disappeared:

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