--- /dev/null
+// Copyright (c) 2019, Daniel Martà <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+package main
+
+// First, sync the files with x/tools and GOROOT.
+//go:generate go run gen.go
+
+// Then, add the missing imports to our added code.
+//go:generate goimports -w .
+
+// Finally, ensure all code follows 'gofumpt -s'. Use the current source, to not
+// need an extra 'go install' step.
+//go:generate go run . -s -w .