message: fix build for rust 1.15
diff: @@ -465,8 +465,8 @@ macro_rules! impl_scalar_partialeq {
  }
  macro_rules! impl_trait_rev {
  - (impl $trait:ident < $scalar:ty > for $res:ty, $method:ident, $ret:ty) => {
  - impl $trait<$res> for $scalar {
  + (impl $trait_name:ident < $scalar:ty > for $res:ty, $method:ident, $ret:ty) => {
  + impl $trait_name<$res> for $scalar {
  #[inline]
  fn $method(&self, other: &$res) -> $ret {
  other.$method(self)
  