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Changes
Downloads the updated roslyn compiler from CombatExtended-Continued/roslyn and uses it to compile CE
References
Links to the associated issues or other related pull requests, e.g.
Reasoning
The mono project is in flux, so the embedded version of the roslyn compiler is stuck on C# 9. The external roslyn compiler supports C# 13. This lets us use C# 13 syntax in CE when beneficial.
Alternatives
Disable automatic building of PRs and use dotnet to compile.
Stick with C# 9 only.
Reimplement the csc frontend (it's actually fairly small, similar to the publicizer stuff)
Testing
Check tests you have performed: