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4f51f6243e
The remote fetcher only works with certain schemes (`http`, `https`, `s3`, and `file`). It's possible for other schemes to show up in this code and it can cause bugs. Before this patch, doing `gem install path:///hello` would result in an infinite loop because this function would do `send "fetch_path"`, calling itself forever. Now we see an exception. I think we should validate gem names earlier, but it's really best practice to restrict the possible strings passed to `send`. https://github.com/rubygems/rubygems/commit/54e2781b73