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Microsoft.CodeAnalysis.CSharp was bumped to 5.9.0 in npgsql#6635, which requires Roslyn 5.9 to load Npgsql.SourceGenerators. SDK 10.0.3xx and earlier ship older compilers (10.0.200 ships 5.3), failing with CS9057. 10.0.400 is the first SDK that includes Roslyn 5.9. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YakHXFUBSSV4annG4xrCH8
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#6635 bumped
Microsoft.CodeAnalysis.CSharp/Analyzersto 5.9.0. A source generator can't reference a newer Roslyn than the compiler that loads it, so buildingNpgsql.SourceGeneratorswith an older SDK fails:global.jsoncurrently allows 10.0.200 (Roslyn 5.3). CI still passes because runners have newer SDKs installed androllForward: latestMajorpicks them. Local builds on an SDK older than 10.0.400 fail.This raises the minimum to 10.0.400, the first SDK that ships Roslyn 5.9. I checked by inspecting
Microsoft.Net.Sdk.Compilers.Toolset: 10.0.303 → 5.6, 10.0.400 → 5.9. Now an SDK that's too old gives a clear "SDK not found" error instead of CS9057.Verified locally:
src/Npgsqlfails with CS9057 on SDK 10.0.200 and builds on 10.0.401.🤖 Generated with Claude Code
https://claude.ai/code/session_01YakHXFUBSSV4annG4xrCH8