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Huh, I have been programming in rust for a long time and I've never noticed such diagnostics.

Well, unless you count an unintentional LLVM crash as a "diagnostic or error", then I've noticed one exactly once...

I believe post-monomorphization errors don't show in cargo check, and those are rather rare in Rust.

Cargo check won't report linker errors, that the only difference I ever ran into.