Would it be possible to change the APIs of Command to include the problem Command in the io::Error?
Alternatively, maybe it's time for an process::Error or maybe an extension crate that makes Command have useful errors?
Nevermind, it seems Command actively prevents you from doing this.
Some time ago I proposed adding a field with the offending filename (if any) to io::Error. It was shot down largely because people didn't want io::Error to have to box up any variable-sized data. I still wish it did, but I can see where they're coming from.
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