// as opposed to precluding determined attempts by
				// users to break things.
				sum := sha256.Sum256([]byte(a.Package.ImportPath))
				coverVar := fmt.Sprintf("goCover_%x_", sum[:6])
				mode := a.Package.Internal.Cover.Mode
				if mode == "" {
					panic("covermode should be set at this point")
				}
				if newoutfiles, err := b.cover2(a, infiles, outfiles, coverVar, mode); err != nil {