writeln! で遅くなるのは flush してるんですかね
と思ったが concat!() してるのでシェル側の問題なのだろうか… https://github.com/rust-lang/rust/blob/23aaeb573b626a51af9ecc97680663153e4ab2b0/src/libcore/macros.rs#L448-L458 …
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と思ったが concat!() してるのでシェル側の問題なのだろうか… https://github.com/rust-lang/rust/blob/23aaeb573b626a51af9ecc97680663153e4ab2b0/src/libcore/macros.rs#L448-L458 …