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Wouldn't MIR be more portable to the future as well? Building on Rust's own equity and all that, because future Rust will probably still use MIR but could replace LLVM(?)

They wouldn't want to do MIR without upstreaming the Rust frontend, which I don't see happening anytime soon.

MIR should stay with Rustc, and that's the point — to work on optimizations that happen in Rustc, and not later when the code is turned over to llvm, or other backend.

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