Unstable functionality in Serde

[dtolnay]

Currently unstable

• Specialization rust-lang/rust#31844
  • The default collect_seq and collect_map specialize for ExactSizeIterator.
• Never type rust-lang/rust#35121
  • Serialize and Deserialize impls for !

Stabilized

• Serialize and Deserialize for NonZero* rust-lang/rust#49137
  • Stabilized in 1.0.60 #1278
• Deserialize for Box<CStr> rust-lang/rust#40380
  • Requires CString::into_boxed_c_str
  • Stabilized in 1.0.61 #1284
• Deserialize for dynamically sized Rc / Arc rust-lang/rust#40475
  • Requires From<Box<T>> for Rc<T> / Arc<T>
  • Stabilized in 1.0.61 #1285

[nox]

Feature zero_one just died. Can we have new versions on both 0.9 and 1.0?

[SimonSapin]

Submitted #898 for zero_one.

[Techcable]

593bcb0 breaks the unstable feature because you removed the nonzero feature flag which is still required by NonZeroU16 and friends.

[dtolnay]

The nonzero feature flag was removed from nightly in rust-lang/rust#50808.

[Techcable]

Thanks so much for the clarification, I didn't realize I was using an outdated nightly!

[dtolnay]

I updated the list to reflect functionality that was stabilized in Serde 1.0.60 and 1.0.61. These are no longer behind the "unstable" cfg.

[dtolnay]

Added never_type in #1302.