starman , 8 days ago

Looks like C# 12 interceptors:

[InterceptsLocation(@"C:\testapp\Program.cs", line: 4, column: 5)]

I know it looks awful, but it's not intended for direct use, but rather for source generators for native ahead of time compilation.

https://andrewlock.net/exploring-the-dotnet-8-preview-changing-method-calls-with-interceptors/