message: use reference in match statement for compat with stable
diff: @@ -342,31 +342,31 @@ impl Type {
  pub fn to_key_size(&self) -> usize {
  match self {
  - Type::Type12Words => 128,
  - Type::Type15Words => 160,
  - Type::Type18Words => 192,
  - Type::Type21Words => 224,
  - Type::Type24Words => 256,
  + &Type::Type12Words => 128,
  + &Type::Type15Words => 160,
  + &Type::Type18Words => 192,
  + &Type::Type21Words => 224,
  + &Type::Type24Words => 256,
  }
  }
  pub fn checksum_size_bits(&self) -> usize {
  match self {
  - Type::Type12Words => 4,
  - Type::Type15Words => 5,
  - Type::Type18Words => 6,
  - Type::Type21Words => 7,
  - Type::Type24Words => 8,
  + &Type::Type12Words => 4,
  + &Type::Type15Words => 5,
  + &Type::Type18Words => 6,
  + &Type::Type21Words => 7,
  + &Type::Type24Words => 8,
  }
  }
  pub fn mnemonic_count(&self) -> usize {
  match self {
  - Type::Type12Words => 12,
  - Type::Type15Words => 15,
  - Type::Type18Words => 18,
  - Type::Type21Words => 21,
  - Type::Type24Words => 24,
  + &Type::Type12Words => 12,
  + &Type::Type15Words => 15,
  + &Type::Type18Words => 18,
  + &Type::Type21Words => 21,
  + &Type::Type24Words => 24,
  }
  }
  