01131684ac
I don't think it's realistic to operate without /proc/. Hence, let's make this explicit. If one day someone finds a way to do what we need without /proc/ we can certainly drop this check again, but for now I think it's a lot friendlier to users to make this explicitly early on instead continuing to run and then not do what we need to do, oftentimes failing in cryptic ways. After all, invoking the tool without /proc/ is not an error that was specific to some of the lines we process, but it's systematic error that will show its ugly face in many codepaths down the line. Fixes: #14745
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