report error when rustup is invoked with unsupported arg0 #2716
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Rustin170506
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Better error fix typo
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This patch will prevent people from experimenting with other proxy names in custom toolchains. I'm not sure if that's a bad thing or not since such custom proxies wouldn't be updated by a |
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custom proxies aren't a use case we have really supported; I think we could start supporting that, but lack of support shouldn't stop us solving concrete issues like this. |
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close #2286