Bump serde from 1.0.68 to 1.0.104

[dependabot-preview]

Bumps serde from 1.0.68 to 1.0.104.

Release notes

Sourced from serde's releases.

v1.0.104

• Revert stabilization of Serialize/Deserialize impls for ! to account for rust-lang/rust#67224

v1.0.103

• Support deserializing untagged unit variants from formats that treat unit as None (#1668)

v1.0.102

• Support deserializing PathBuf from bytes like &Path already did, and support deserializing Box<Path> (#1656, thanks @​heftig)

v1.0.101

• Report errors on malformed serde attributes, like #[serde(rename =)] -- the compiler used to reject these itself, but when the compiler relaxed its requirements on attribute syntax these malformed attributes began silently being ignored by serde_derive

• Eliminate unused variable warning when using skip_serializing inside a tuple variant of an adjacently tagged enum (#1617, thanks @​arilotter)

• Support skip attribute inside of newtype variants (#1622, thanks @​Xaeroxe)

v1.0.100

• Provide serde::ser::StdError and serde::de::StdError which are either a re-export of std::error::Error (if Serde's "std" feature is enabled) or a new identical trait (otherwise).

  #[cfg(feature = "std")]
  pub use std::error::Error as StdError;
  
  #[cfg(not(feature = "std"))]
  pub trait StdError: Debug + Display {
      fn source(&self) -> Option<&(StdError + 'static)> { None }
  }

  Serde's error traits serde::ser::Error and serde::de::Error require std::error::Error as a supertrait, but only when Serde is built with "std" enabled. Data formats that don't care about no_std support should generally provide their error types with a std::error::Error impl directly:

  #[derive(Debug)]
  struct MySerError {...}
  
  impl serde::ser::Error for MySerError {...}
  
  impl std::fmt::Display for MySerError {...}
  
  // We don't support no_std!
  impl std::error::Error for MySerError {}

  Data formats that do support no_std may either have a "std" feature of their own as has been required in the past:

  [features]
  std = ["serde/std"]

... (truncated)

Commits

• 234fbfd Release 1.0.104
• b9909ce Revert "Remove never_type feature gate"
• d540e72 Format with rustfmt 2019-10-07
• 13d0899 Add missing import in de_enum expand test
• 4fefa7a Format imports in expandtest inputs
• 9048660 Update test suite to nightly-2019-11-26
• 0b303c7 Mark tests ignored on emscripten rather than omitting
• c371563 Reduce nesting of macrotest test cases
• d17d8eb Rely on std::process::Command's path search
• bcaebdb Merge pull request #1662 from eupn/use-macrotest
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #104.