從 CAS 下載工具鍊並列印操作說明
usage: fx fetch-toolchain <CAS_DIGEST>
Downloads the toolchain specified by <CAS_DIGEST> to $FUCHSIA_DIR/local/toolchain/<CAS_DIGEST>.
Prints instructions for how to use it with `fx set` or in `args.gn`.
fx fetch-toolchain
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上次更新時間：2026-04-21 (世界標準時間)。
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