if fields != nil {
		for _, field := range fields.List {
			for _, name := range field.Names {
				if f(name.Name) {
					return true
				}
			}
		}
	}
	return false
}

func matchDecl(d *ast.GenDecl, f Filter) bool {
	for _, d := range d.Specs {
		switch v := d.(type) {
		case *ast.ValueSpec:
			for _, name := range v.Names {
				if f(name.Name) {
					return true
				}
			}