Give correct error message if user tries to install an unavailable toolchain #1380
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Currently if a user runs `rustup install unavailable-toolchain`, the error message is: `error: toolchain 'unavailable-toolchain' is not installed`. This is error message is weird, since the user runs rustup to install the toolchain. This commit copies the "InvalidToolchainName" error from rustup-dist, and configures rustup install to use this error.
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Currently if a user runs
rustup install unavailable-toolchain, the error message is:error: toolchain 'unavailable-toolchain' is not installed. This is error message is weird, since the user runs rustup to install the toolchain. This commit copies the "InvalidToolchainName error from rustup-dist, and configures rustup install to use this error.