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Collect VTable stats & add `-Zprint-vtable-sizes` This is a bit hacky/buggy, but I'm not entirely sure how to fix it, so I want to ask reviewers for help... To try this, use either of those: - `cargo clean && RUSTFLAGS="-Zprint-vtable-sizes" cargo +toolchain b` - `cargo clean && cargo rustc +toolchain -Zprint-vtable-sizes` - `rustc +toolchain -Zprint-vtable-sizes ./file.rs`