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Can't the Rust compiler cache the evaluated outputs?

In theory yes, with the current LLVM toolchain doesn't look like it.

LLVM has nothing to do with `const` evaluation in Rust. `const` evaluation happens at the MIR level which participates in incremental compilation.

> cache the evaluated outputs

Was the point of my answer.

Apologies but as your comment currently stands, it reads to me like "in theory yes, but actually no".