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I'm sure that's a requirement for being a "Tier-1" language.
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Eh, they call TypeScript a tier 1 language too.
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... but why? The MSVC backend has been falling far behind LLVM with every release. I understand they want uniformity but IMHO either they catch up or they switch fully to LLVM, if they can
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Windows ecosystem, and all those things MSVC backend can do and LLVM does not.

For the same reason a Rust frontend is being developed for GCC.

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MSVC always was the default backend for Windows platforms.
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Codegen was still done via LLVM. LLVM supports the MSVC _runtime_, here they're talking about using their (arguably worse) backend directly to generate code and do optimisations
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