列印 MIR 的命令
cargo +nightly rustc -- -Z unpretty=mir
列印 enum 各個 variants 體積的命令
參考 https://nnethercote.github.io...
rustc +nightly -Zprint-type-sizes input.rs
cargo +nightly rustc -- -Z unpretty=mir
參考 https://nnethercote.github.io...
rustc +nightly -Zprint-type-sizes input.rs