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fuzz: csharp/fsharp_fuzz_test on Windows (part of #9727) - #9749
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… and a portable SharpFuzz step (part of #9727) Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Xut2hwESun1HL2eSVd1d5B
… fuzzer (part of #9727) Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Xut2hwESun1HL2eSVd1d5B
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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Xut2hwESun1HL2eSVd1d5B
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Part of #9727.
Windows: the hermetic MSVC ABI layer rejects the asan and fuzzer features (CI run 42603065840: 'MSVC ABI Layer 1 does not support feature(s): asan, fuzzer'), so csharp/fsharp_fuzz_test stays Linux only. macOS: libfuzzer-dotnet needs SysV shm and has no driver, target is incompatible (run 42603070032); unsupported.
This PR keeps the portable SharpFuzz instrument step (rust_binary //dotnet/fuzz:instrument via ctx.actions.run instead of run_shell). Remaining for #9727: Windows needs a toolchain with libFuzzer support. Nested-workspace fixtures were not run locally.
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https://claude.ai/code/session_01Xut2hwESun1HL2eSVd1d5B