Chain ErrorKind::HttpStatus(404) to Download404 #515
Merged
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Rust pre-1.8.0 didn't have any manifests, so this leads to status 404.
Only error
CURLE_FILE_COULDNT_READ_FILE
was mapping toDownload404
though, so a "successful" status 404 was causing rustup to give up on
old versions entirely. Now status 404 is mapped correctly too, and the
manifest fallbacks work correctly.
Fixes #487.
Fixes #502.