Fix rust-analyzer install when not available.#87007

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bors merged 3 commits intorust-lang:masterfrom

ehuss:fix-rust-analyzer-install

Jul 13, 2021

Commits on Jul 9, 2021

Fix rust-analyzer install when not available.
ehuss
committed

Commits on Jul 11, 2021

Add comments why install steps should never fail.
ehuss
committed

Commits on Jul 12, 2021

Provide a better error when `x.py install src/doc` doesn't work.
ehuss
committed