The first time I used MIRI, it took one or two minutes (on x86_64-pc-windows-msvc), and when I used it again it finished almost immediately. I have no idea what it did and would like to know.
Miri needs to build std with custom flags. I'm not an expert on what all is bundled in the sysroot, but you can find your (normal, non-miri) sysroot with rustc --print sysroot.
So the so-called "sysroot" in Rust context means std? I think we can add some hints or progress bars, similar to the cargo build process.
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