Remove toolchain directory if initial toolchain install fails #574
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If initial toolchain installation fails it leaves behind a directory, which confuses rustup into thinking it's installed.
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If initial toolchain installation fails it leaves behind a directory,
which confuses rustup into thinking it's installed.
Again, I don't have any good way to test this. I think the best thing would be to write a FUSE filesystem, but I could also see using environment variables to mock out rustup's file system functions to return weird errors.
r? @alexcrichton
Related to #275 and #330