When a user reports an error in a Roslyn Analyzer or a Source Generator, you may need to know the version of Roslyn and the language version currently in use. The compiler provides everything you need. Simply add #error version to any source file and check the compiler output:
C#
#error version
// ... rest of the file ...
The CS8304 error message includes the Roslyn version (with the commit hash from the Roslyn repository) and the language version.
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