message: rename local struct "_" to "local" in make_pipeable
diff: @@ -105,15 +105,15 @@ namespace ranges
  template<typename Fun>
  constexpr auto operator()(Fun fun) const
  {
  - struct _
  + struct local
  : Fun
  , pipeable_base
  {
  - constexpr explicit _(Fun && f)
  + constexpr explicit local(Fun && f)
  : Fun(static_cast<Fun &&>(f))
  {}
  };
  - return _{static_cast<Fun &&>(fun)};
  + return local{static_cast<Fun &&>(fun)};
  }
  };
  