ast.Inspect(file, func(n ast.Node) bool {
			switch n := n.(type) {
			case *ast.File:
				if isDeprecated(n.Doc) {
					mark(n.Name)
				}
				return true
			case *ast.GenDecl:
				if isDeprecated(n.Doc) {
					for _, spec := range n.Specs {
						switch spec := spec.(type) {
						case *ast.ValueSpec:
							for _, id := range spec.Names {
								mark(id)
							}